diff --git a/openpype/hooks/pre_copy_template_workfile.py b/openpype/hooks/pre_copy_template_workfile.py
index 29a522f933..5c56d721e8 100644
--- a/openpype/hooks/pre_copy_template_workfile.py
+++ b/openpype/hooks/pre_copy_template_workfile.py
@@ -49,7 +49,7 @@ class CopyTemplateWorkfile(PreLaunchHook):
             ))
             return
 
-        self.log.info("Last workfile does not exits.")
+        self.log.info("Last workfile does not exist.")
 
         project_name = self.data["project_name"]
         asset_name = self.data["asset_name"]
diff --git a/openpype/hosts/nuke/api/lib.py b/openpype/hosts/nuke/api/lib.py
index 5f898a9a67..7e7cd27f90 100644
--- a/openpype/hosts/nuke/api/lib.py
+++ b/openpype/hosts/nuke/api/lib.py
@@ -1660,9 +1660,13 @@ def find_free_space_to_paste_nodes(
 def launch_workfiles_app():
     '''Function letting start workfiles after start of host
     '''
-    # get state from settings
-    open_at_start = get_current_project_settings()["nuke"].get(
-        "general", {}).get("open_workfile_at_start")
+    from openpype.lib import (
+        env_value_to_bool
+    )
+    # get all imortant settings
+    open_at_start = env_value_to_bool(
+        env_key="OPENPYPE_WORKFILE_TOOL_ON_START",
+        default=None)
 
     # return if none is defined
     if not open_at_start:
diff --git a/openpype/lib/applications.py b/openpype/lib/applications.py
index e1b304a351..ada194f15f 100644
--- a/openpype/lib/applications.py
+++ b/openpype/lib/applications.py
@@ -1302,10 +1302,18 @@ def _prepare_last_workfile(data, workdir):
     )
     data["start_last_workfile"] = start_last_workfile
 
+    workfile_startup = should_workfile_tool_start(
+        project_name, app.host_name, task_name
+    )
+    data["workfile_startup"] = workfile_startup
+
     # Store boolean as "0"(False) or "1"(True)
     data["env"]["AVALON_OPEN_LAST_WORKFILE"] = (
         str(int(bool(start_last_workfile)))
     )
+    data["env"]["OPENPYPE_WORKFILE_TOOL_ON_START"] = (
+        str(int(bool(workfile_startup)))
+    )
 
     _sub_msg = "" if start_last_workfile else " not"
     log.debug(
@@ -1344,40 +1352,9 @@ def _prepare_last_workfile(data, workdir):
     data["last_workfile_path"] = last_workfile_path
 
 
-def should_start_last_workfile(
-    project_name, host_name, task_name, default_output=False
+def get_option_from_settings(
+    startup_presets, host_name, task_name, default_output
 ):
-    """Define if host should start last version workfile if possible.
-
-    Default output is `False`. Can be overriden with environment variable
-    `AVALON_OPEN_LAST_WORKFILE`, valid values without case sensitivity are
-    `"0", "1", "true", "false", "yes", "no"`.
-
-    Args:
-        project_name (str): Name of project.
-        host_name (str): Name of host which is launched. In avalon's
-            application context it's value stored in app definition under
-            key `"application_dir"`. Is not case sensitive.
-        task_name (str): Name of task which is used for launching the host.
-            Task name is not case sensitive.
-
-    Returns:
-        bool: True if host should start workfile.
-
-    """
-
-    project_settings = get_project_settings(project_name)
-    startup_presets = (
-        project_settings
-        ["global"]
-        ["tools"]
-        ["Workfiles"]
-        ["last_workfile_on_startup"]
-    )
-
-    if not startup_presets:
-        return default_output
-
     host_name_lowered = host_name.lower()
     task_name_lowered = task_name.lower()
 
@@ -1421,6 +1398,82 @@ def should_start_last_workfile(
     return default_output
 
 
+def should_start_last_workfile(
+    project_name, host_name, task_name, default_output=False
+):
+    """Define if host should start last version workfile if possible.
+
+    Default output is `False`. Can be overriden with environment variable
+    `AVALON_OPEN_LAST_WORKFILE`, valid values without case sensitivity are
+    `"0", "1", "true", "false", "yes", "no"`.
+
+    Args:
+        project_name (str): Name of project.
+        host_name (str): Name of host which is launched. In avalon's
+            application context it's value stored in app definition under
+            key `"application_dir"`. Is not case sensitive.
+        task_name (str): Name of task which is used for launching the host.
+            Task name is not case sensitive.
+
+    Returns:
+        bool: True if host should start workfile.
+
+    """
+
+    project_settings = get_project_settings(project_name)
+    startup_presets = (
+        project_settings
+        ["global"]
+        ["tools"]
+        ["Workfiles"]
+        ["last_workfile_on_startup"]
+    )
+
+    if not startup_presets:
+        return default_output
+
+    return get_option_from_settings(
+        startup_presets, host_name, task_name, default_output)
+
+
+def should_workfile_tool_start(
+    project_name, host_name, task_name, default_output=False
+):
+    """Define if host should start workfile tool at host launch.
+
+    Default output is `False`. Can be overriden with environment variable
+    `OPENPYPE_WORKFILE_TOOL_ON_START`, valid values without case sensitivity are
+    `"0", "1", "true", "false", "yes", "no"`.
+
+    Args:
+        project_name (str): Name of project.
+        host_name (str): Name of host which is launched. In avalon's
+            application context it's value stored in app definition under
+            key `"application_dir"`. Is not case sensitive.
+        task_name (str): Name of task which is used for launching the host.
+            Task name is not case sensitive.
+
+    Returns:
+        bool: True if host should start workfile.
+
+    """
+
+    project_settings = get_project_settings(project_name)
+    startup_presets = (
+        project_settings
+        ["global"]
+        ["tools"]
+        ["Workfiles"]
+        ["open_workfile_tool_on_startup"]
+    )
+
+    if not startup_presets:
+        return default_output
+
+    return get_option_from_settings(
+        startup_presets, host_name, task_name, default_output)
+
+
 def compile_list_of_regexes(in_list):
     """Convert strings in entered list to compiled regex objects."""
     regexes = list()
diff --git a/openpype/modules/ftrack/event_handlers_user/action_applications.py b/openpype/modules/ftrack/event_handlers_user/action_applications.py
index 23c96e1b9f..74d14c2fc4 100644
--- a/openpype/modules/ftrack/event_handlers_user/action_applications.py
+++ b/openpype/modules/ftrack/event_handlers_user/action_applications.py
@@ -11,29 +11,44 @@ from avalon.api import AvalonMongoDB
 
 
 class AppplicationsAction(BaseAction):
-    """Application Action class.
-
-    Args:
-        session (ftrack_api.Session): Session where action will be registered.
-        label (str): A descriptive string identifing your action.
-        varaint (str, optional): To group actions together, give them the same
-            label and specify a unique variant per action.
-        identifier (str): An unique identifier for app.
-        description (str): A verbose descriptive text for you action.
-        icon (str): Url path to icon which will be shown in Ftrack web.
-    """
+    """Applications Action class."""
 
     type = "Application"
     label = "Application action"
-    identifier = "pype_app.{}.".format(str(uuid4()))
+
+    identifier = "openpype_app"
+    _launch_identifier_with_id = None
+
     icon_url = os.environ.get("OPENPYPE_STATICS_SERVER")
 
     def __init__(self, *args, **kwargs):
-        super().__init__(*args, **kwargs)
+        super(AppplicationsAction, self).__init__(*args, **kwargs)
 
         self.application_manager = ApplicationManager()
         self.dbcon = AvalonMongoDB()
 
+    @property
+    def discover_identifier(self):
+        if self._discover_identifier is None:
+            self._discover_identifier = "{}.{}".format(
+                self.identifier, self.process_identifier()
+            )
+        return self._discover_identifier
+
+    @property
+    def launch_identifier(self):
+        if self._launch_identifier is None:
+            self._launch_identifier = "{}.*".format(self.identifier)
+        return self._launch_identifier
+
+    @property
+    def launch_identifier_with_id(self):
+        if self._launch_identifier_with_id is None:
+            self._launch_identifier_with_id = "{}.{}".format(
+                self.identifier, self.process_identifier()
+            )
+        return self._launch_identifier_with_id
+
     def construct_requirements_validations(self):
         # Override validation as this action does not need them
         return
@@ -56,7 +71,7 @@ class AppplicationsAction(BaseAction):
             " and data.actionIdentifier={0}"
             " and source.user.username={1}"
         ).format(
-            self.identifier + "*",
+            self.launch_identifier,
             self.session.api_user
         )
         self.session.event_hub.subscribe(
@@ -136,12 +151,29 @@ class AppplicationsAction(BaseAction):
                 "label": app.group.label,
                 "variant": app.label,
                 "description": None,
-                "actionIdentifier": self.identifier + app_name,
+                "actionIdentifier": "{}.{}".format(
+                    self.launch_identifier_with_id, app_name
+                ),
                 "icon": app_icon
             })
 
         return items
 
+    def _launch(self, event):
+        event_identifier = event["data"]["actionIdentifier"]
+        # Check if identifier is same
+        # - show message that acion may not be triggered on this machine
+        if event_identifier.startswith(self.launch_identifier_with_id):
+            return BaseAction._launch(self, event)
+
+        return {
+            "success": False,
+            "message": (
+                "There are running more OpenPype processes"
+                " where Application can be launched."
+            )
+        }
+
     def launch(self, session, entities, event):
         """Callback method for the custom action.
 
@@ -162,7 +194,8 @@ class AppplicationsAction(BaseAction):
         *event* the unmodified original event
         """
         identifier = event["data"]["actionIdentifier"]
-        app_name = identifier[len(self.identifier):]
+        id_identifier_len = len(self.launch_identifier_with_id) + 1
+        app_name = identifier[id_identifier_len:]
 
         entity = entities[0]
 
diff --git a/openpype/modules/ftrack/event_handlers_user/action_multiple_notes.py b/openpype/modules/ftrack/event_handlers_user/action_multiple_notes.py
index 8db65fe39b..f5af044de0 100644
--- a/openpype/modules/ftrack/event_handlers_user/action_multiple_notes.py
+++ b/openpype/modules/ftrack/event_handlers_user/action_multiple_notes.py
@@ -9,16 +9,24 @@ class MultipleNotes(BaseAction):
     #: Action label.
     label = 'Multiple Notes'
     #: Action description.
-    description = 'Add same note to multiple Asset Versions'
+    description = 'Add same note to multiple entities'
     icon = statics_icon("ftrack", "action_icons", "MultipleNotes.svg")
 
     def discover(self, session, entities, event):
         ''' Validation '''
         valid = True
+
+        # Check for multiple selection.
+        if len(entities) < 2:
+            valid = False
+
+        # Check for valid entities.
+        valid_entity_types = ['assetversion', 'task']
         for entity in entities:
-            if entity.entity_type.lower() != 'assetversion':
+            if entity.entity_type.lower() not in valid_entity_types:
                 valid = False
                 break
+
         return valid
 
     def interface(self, session, entities, event):
@@ -58,7 +66,7 @@ class MultipleNotes(BaseAction):
 
             splitter = {
                 'type': 'label',
-                'value': '{}'.format(200*"-")
+                'value': '{}'.format(200 * "-")
             }
 
             items = []
diff --git a/openpype/modules/ftrack/event_handlers_user/action_prepare_project.py b/openpype/modules/ftrack/event_handlers_user/action_prepare_project.py
index ea0bfa2971..4b42500e8f 100644
--- a/openpype/modules/ftrack/event_handlers_user/action_prepare_project.py
+++ b/openpype/modules/ftrack/event_handlers_user/action_prepare_project.py
@@ -428,9 +428,11 @@ class PrepareProjectLocal(BaseAction):
 
         # Trigger create project structure action
         if create_project_structure_checked:
-            self.trigger_action(
-                self.create_project_structure_identifier, event
+            trigger_identifier = "{}.{}".format(
+                self.create_project_structure_identifier,
+                self.process_identifier()
             )
+            self.trigger_action(trigger_identifier, event)
         return True
 
 
diff --git a/openpype/modules/ftrack/event_handlers_user/action_where_run_show.py b/openpype/modules/ftrack/event_handlers_user/action_where_run_show.py
index 4ce1a439a3..b8b49e86cb 100644
--- a/openpype/modules/ftrack/event_handlers_user/action_where_run_show.py
+++ b/openpype/modules/ftrack/event_handlers_user/action_where_run_show.py
@@ -24,6 +24,10 @@ class ActionShowWhereIRun(BaseAction):
 
         return False
 
+    @property
+    def launch_identifier(self):
+        return self.identifier
+
     def launch(self, session, entities, event):
         # Don't show info when was launch from this session
         if session.event_hub.id == event.get("data", {}).get("event_hub_id"):
diff --git a/openpype/modules/ftrack/lib/ftrack_action_handler.py b/openpype/modules/ftrack/lib/ftrack_action_handler.py
index 2bff9d8cb3..b24fe5f12a 100644
--- a/openpype/modules/ftrack/lib/ftrack_action_handler.py
+++ b/openpype/modules/ftrack/lib/ftrack_action_handler.py
@@ -29,6 +29,9 @@ class BaseAction(BaseHandler):
     icon = None
     type = 'Action'
 
+    _discover_identifier = None
+    _launch_identifier = None
+
     settings_frack_subkey = "user_handlers"
     settings_enabled_key = "enabled"
 
@@ -42,6 +45,22 @@ class BaseAction(BaseHandler):
 
         super().__init__(session)
 
+    @property
+    def discover_identifier(self):
+        if self._discover_identifier is None:
+            self._discover_identifier = "{}.{}".format(
+                self.identifier, self.process_identifier()
+            )
+        return self._discover_identifier
+
+    @property
+    def launch_identifier(self):
+        if self._launch_identifier is None:
+            self._launch_identifier = "{}.{}".format(
+                self.identifier, self.process_identifier()
+            )
+        return self._launch_identifier
+
     def register(self):
         '''
         Registers the action, subscribing the the discover and launch topics.
@@ -60,7 +79,7 @@ class BaseAction(BaseHandler):
             ' and data.actionIdentifier={0}'
             ' and source.user.username={1}'
         ).format(
-            self.identifier,
+            self.launch_identifier,
             self.session.api_user
         )
         self.session.event_hub.subscribe(
@@ -86,7 +105,7 @@ class BaseAction(BaseHandler):
                 'label': self.label,
                 'variant': self.variant,
                 'description': self.description,
-                'actionIdentifier': self.identifier,
+                'actionIdentifier': self.discover_identifier,
                 'icon': self.icon,
             }]
         }
@@ -309,6 +328,78 @@ class BaseAction(BaseHandler):
         return True
 
 
+class LocalAction(BaseAction):
+    """Action that warn user when more Processes with same action are running.
+
+    Action is launched all the time but if id does not match id of current
+    instanace then message is shown to user.
+
+    Handy for actions where matters if is executed on specific machine.
+    """
+    _full_launch_identifier = None
+
+    @property
+    def discover_identifier(self):
+        if self._discover_identifier is None:
+            self._discover_identifier = "{}.{}".format(
+                self.identifier, self.process_identifier()
+            )
+        return self._discover_identifier
+
+    @property
+    def launch_identifier(self):
+        """Catch all topics with same identifier."""
+        if self._launch_identifier is None:
+            self._launch_identifier = "{}.*".format(self.identifier)
+        return self._launch_identifier
+
+    @property
+    def full_launch_identifier(self):
+        """Catch all topics with same identifier."""
+        if self._full_launch_identifier is None:
+            self._full_launch_identifier = "{}.{}".format(
+                self.identifier, self.process_identifier()
+            )
+        return self._full_launch_identifier
+
+    def _discover(self, event):
+        entities = self._translate_event(event)
+        if not entities:
+            return
+
+        accepts = self.discover(self.session, entities, event)
+        if not accepts:
+            return
+
+        self.log.debug("Discovering action with selection: {0}".format(
+            event["data"].get("selection", [])
+        ))
+
+        return {
+            "items": [{
+                "label": self.label,
+                "variant": self.variant,
+                "description": self.description,
+                "actionIdentifier": self.discover_identifier,
+                "icon": self.icon,
+            }]
+        }
+
+    def _launch(self, event):
+        event_identifier = event["data"]["actionIdentifier"]
+        # Check if identifier is same
+        # - show message that acion may not be triggered on this machine
+        if event_identifier != self.full_launch_identifier:
+            return {
+                "success": False,
+                "message": (
+                    "There are running more OpenPype processes"
+                    " where this action could be launched."
+                )
+            }
+        return super(LocalAction, self)._launch(event)
+
+
 class ServerAction(BaseAction):
     """Action class meant to be used on event server.
 
@@ -318,6 +409,14 @@ class ServerAction(BaseAction):
 
     settings_frack_subkey = "events"
 
+    @property
+    def discover_identifier(self):
+        return self.identifier
+
+    @property
+    def launch_identifier(self):
+        return self.identifier
+
     def register(self):
         """Register subcription to Ftrack event hub."""
         self.session.event_hub.subscribe(
@@ -328,5 +427,5 @@ class ServerAction(BaseAction):
 
         launch_subscription = (
             "topic=ftrack.action.launch and data.actionIdentifier={0}"
-        ).format(self.identifier)
+        ).format(self.launch_identifier)
         self.session.event_hub.subscribe(launch_subscription, self._launch)
diff --git a/openpype/modules/ftrack/lib/ftrack_base_handler.py b/openpype/modules/ftrack/lib/ftrack_base_handler.py
index 011ce8db9d..b8be287a03 100644
--- a/openpype/modules/ftrack/lib/ftrack_base_handler.py
+++ b/openpype/modules/ftrack/lib/ftrack_base_handler.py
@@ -2,6 +2,7 @@ import os
 import tempfile
 import json
 import functools
+import uuid
 import datetime
 import traceback
 import time
@@ -36,6 +37,7 @@ class BaseHandler(object):
     <description>   - a verbose descriptive text for you action
     <icon>  - icon in ftrack
     '''
+    _process_id = None
     # Default priority is 100
     priority = 100
     # Type is just for logging purpose (e.g.: Action, Event, Application,...)
@@ -70,6 +72,13 @@ class BaseHandler(object):
         self.register = self.register_decorator(self.register)
         self.launch = self.launch_log(self.launch)
 
+    @staticmethod
+    def process_identifier():
+        """Helper property to have """
+        if not BaseHandler._process_id:
+            BaseHandler._process_id = str(uuid.uuid4())
+        return BaseHandler._process_id
+
     # Decorator
     def register_decorator(self, func):
         @functools.wraps(func)
diff --git a/openpype/modules/log_viewer/tray/app.py b/openpype/modules/log_viewer/tray/app.py
index 9aab37cd20..1e8d6483cd 100644
--- a/openpype/modules/log_viewer/tray/app.py
+++ b/openpype/modules/log_viewer/tray/app.py
@@ -7,12 +7,13 @@ class LogsWindow(QtWidgets.QWidget):
     def __init__(self, parent=None):
         super(LogsWindow, self).__init__(parent)
 
-        self.setStyleSheet(style.load_stylesheet())
+        self.setWindowTitle("Logs viewer")
+
         self.resize(1400, 800)
         log_detail = OutputWidget(parent=self)
         logs_widget = LogsWidget(log_detail, parent=self)
 
-        main_layout = QtWidgets.QHBoxLayout()
+        main_layout = QtWidgets.QHBoxLayout(self)
 
         log_splitter = QtWidgets.QSplitter(self)
         log_splitter.setOrientation(QtCore.Qt.Horizontal)
@@ -24,5 +25,4 @@ class LogsWindow(QtWidgets.QWidget):
         self.logs_widget = logs_widget
         self.log_detail = log_detail
 
-        self.setLayout(main_layout)
-        self.setWindowTitle("Logs")
+        self.setStyleSheet(style.load_stylesheet())
diff --git a/openpype/modules/log_viewer/tray/widgets.py b/openpype/modules/log_viewer/tray/widgets.py
index b9a8499a4c..5a67780413 100644
--- a/openpype/modules/log_viewer/tray/widgets.py
+++ b/openpype/modules/log_viewer/tray/widgets.py
@@ -77,12 +77,10 @@ class CustomCombo(QtWidgets.QWidget):
         toolbutton.setMenu(toolmenu)
         toolbutton.setPopupMode(QtWidgets.QToolButton.MenuButtonPopup)
 
-        layout = QtWidgets.QHBoxLayout()
+        layout = QtWidgets.QHBoxLayout(self)
         layout.setContentsMargins(0, 0, 0, 0)
         layout.addWidget(toolbutton)
 
-        self.setLayout(layout)
-
         toolmenu.selection_changed.connect(self.selection_changed)
 
         self.toolbutton = toolbutton
@@ -141,7 +139,6 @@ class LogsWidget(QtWidgets.QWidget):
         filter_layout.addWidget(refresh_btn)
 
         view = QtWidgets.QTreeView(self)
-        view.setAllColumnsShowFocus(True)
         view.setEditTriggers(QtWidgets.QAbstractItemView.NoEditTriggers)
 
         layout = QtWidgets.QVBoxLayout(self)
@@ -229,9 +226,9 @@ class OutputWidget(QtWidgets.QWidget):
         super(OutputWidget, self).__init__(parent=parent)
         layout = QtWidgets.QVBoxLayout(self)
 
-        show_timecode_checkbox = QtWidgets.QCheckBox("Show timestamp")
+        show_timecode_checkbox = QtWidgets.QCheckBox("Show timestamp", self)
 
-        output_text = QtWidgets.QTextEdit()
+        output_text = QtWidgets.QTextEdit(self)
         output_text.setReadOnly(True)
         # output_text.setLineWrapMode(QtWidgets.QTextEdit.FixedPixelWidth)
 
diff --git a/openpype/modules/timers_manager/rest_api.py b/openpype/modules/timers_manager/rest_api.py
index 975c1a91f9..ac8d8b7b74 100644
--- a/openpype/modules/timers_manager/rest_api.py
+++ b/openpype/modules/timers_manager/rest_api.py
@@ -3,6 +3,7 @@ from openpype.api import Logger
 
 log = Logger().get_logger("Event processor")
 
+
 class TimersManagerModuleRestApi:
     """
         REST API endpoint used for calling from hosts when context change
@@ -22,6 +23,11 @@ class TimersManagerModuleRestApi:
             self.prefix + "/start_timer",
             self.start_timer
         )
+        self.server_manager.add_route(
+            "POST",
+            self.prefix + "/stop_timer",
+            self.stop_timer
+        )
 
     async def start_timer(self, request):
         data = await request.json()
@@ -38,3 +44,7 @@ class TimersManagerModuleRestApi:
         self.module.stop_timers()
         self.module.start_timer(project_name, asset_name, task_name, hierarchy)
         return Response(status=200)
+
+    async def stop_timer(self, request):
+        self.module.stop_timers()
+        return Response(status=200)
diff --git a/openpype/settings/defaults/project_settings/global.json b/openpype/settings/defaults/project_settings/global.json
index 43053c38c0..636acc0d17 100644
--- a/openpype/settings/defaults/project_settings/global.json
+++ b/openpype/settings/defaults/project_settings/global.json
@@ -260,6 +260,13 @@
                     "enabled": true
                 }
             ],
+            "open_workfile_tool_on_startup": [
+                {
+                    "hosts": [],
+                    "tasks": [],
+                    "enabled": false
+                }
+            ],
             "sw_folders": {
                 "compositing": [
                     "nuke",
diff --git a/openpype/settings/entities/enum_entity.py b/openpype/settings/entities/enum_entity.py
index d306eca7ef..4f6a2886bc 100644
--- a/openpype/settings/entities/enum_entity.py
+++ b/openpype/settings/entities/enum_entity.py
@@ -1,3 +1,4 @@
+import copy
 from .input_entities import InputEntity
 from .exceptions import EntitySchemaError
 from .lib import (
@@ -118,30 +119,43 @@ class HostsEnumEntity(BaseEnumEntity):
     implementation instead of application name.
     """
     schema_types = ["hosts-enum"]
+    all_host_names = [
+        "aftereffects",
+        "blender",
+        "celaction",
+        "fusion",
+        "harmony",
+        "hiero",
+        "houdini",
+        "maya",
+        "nuke",
+        "photoshop",
+        "resolve",
+        "tvpaint",
+        "unreal",
+        "standalonepublisher"
+    ]
 
     def _item_initalization(self):
         self.multiselection = self.schema_data.get("multiselection", True)
-        self.use_empty_value = self.schema_data.get(
-            "use_empty_value", not self.multiselection
-        )
+        use_empty_value = False
+        if not self.multiselection:
+            use_empty_value = self.schema_data.get(
+                "use_empty_value", use_empty_value
+            )
+        self.use_empty_value = use_empty_value
+
+        hosts_filter = self.schema_data.get("hosts_filter") or []
+        self.hosts_filter = hosts_filter
+
         custom_labels = self.schema_data.get("custom_labels") or {}
 
-        host_names = [
-            "aftereffects",
-            "blender",
-            "celaction",
-            "fusion",
-            "harmony",
-            "hiero",
-            "houdini",
-            "maya",
-            "nuke",
-            "photoshop",
-            "resolve",
-            "tvpaint",
-            "unreal",
-            "standalonepublisher"
-        ]
+        host_names = copy.deepcopy(self.all_host_names)
+        if hosts_filter:
+            for host_name in tuple(host_names):
+                if host_name not in hosts_filter:
+                    host_names.remove(host_name)
+
         if self.use_empty_value:
             host_names.insert(0, "")
             # Add default label for empty value if not available
@@ -173,6 +187,44 @@ class HostsEnumEntity(BaseEnumEntity):
         # GUI attribute
         self.placeholder = self.schema_data.get("placeholder")
 
+    def schema_validations(self):
+        if self.hosts_filter:
+            enum_len = len(self.enum_items)
+            if (
+                enum_len == 0
+                or (enum_len == 1 and self.use_empty_value)
+            ):
+                joined_filters = ", ".join([
+                    '"{}"'.format(item)
+                    for item in self.hosts_filter
+                ])
+                reason = (
+                    "All host names were removed after applying"
+                    " host filters. {}"
+                ).format(joined_filters)
+                raise EntitySchemaError(self, reason)
+
+            invalid_filters = set()
+            for item in self.hosts_filter:
+                if item not in self.all_host_names:
+                    invalid_filters.add(item)
+
+            if invalid_filters:
+                joined_filters = ", ".join([
+                    '"{}"'.format(item)
+                    for item in self.hosts_filter
+                ])
+                expected_hosts = ", ".join([
+                    '"{}"'.format(item)
+                    for item in self.all_host_names
+                ])
+                self.log.warning((
+                    "Host filters containt invalid host names:"
+                    " \"{}\" Expected values are {}"
+                ).format(joined_filters, expected_hosts))
+
+        super(HostsEnumEntity, self).schema_validations()
+
 
 class AppsEnumEntity(BaseEnumEntity):
     schema_types = ["apps-enum"]
diff --git a/openpype/settings/entities/schemas/README.md b/openpype/settings/entities/schemas/README.md
index e5122094f6..079d16c506 100644
--- a/openpype/settings/entities/schemas/README.md
+++ b/openpype/settings/entities/schemas/README.md
@@ -379,6 +379,9 @@ How output of the schema could look like on save:
 - multiselection can be allowed with setting key `"multiselection"` to `True` (Default: `False`)
 - it is possible to add empty value (represented with empty string) with setting `"use_empty_value"` to `True` (Default: `False`)
 - it is possible to set `"custom_labels"` for host names where key `""` is empty value (Default: `{}`)
+- to filter host names it is required to define `"hosts_filter"` which is list of host names that will be available
+    - do not pass empty string if `use_empty_value` is enabled
+    - ignoring host names would be more dangerous in some cases
 ```
 {
     "key": "host",
@@ -389,7 +392,10 @@ How output of the schema could look like on save:
     "custom_labels": {
         "": "N/A",
         "nuke": "Nuke"
-    }
+    },
+    "hosts_filter": [
+        "nuke"
+    ]
 }
 ```
 
diff --git a/openpype/settings/entities/schemas/projects_schema/schemas/schema_global_tools.json b/openpype/settings/entities/schemas/projects_schema/schemas/schema_global_tools.json
index 8c92a45a56..9e39eeb39e 100644
--- a/openpype/settings/entities/schemas/projects_schema/schemas/schema_global_tools.json
+++ b/openpype/settings/entities/schemas/projects_schema/schemas/schema_global_tools.json
@@ -78,7 +78,57 @@
                                 "type": "hosts-enum",
                                 "key": "hosts",
                                 "label": "Hosts",
-                                "multiselection": true
+                                "multiselection": true,
+                                "hosts_filter": [
+                                      "aftereffects",
+                                      "blender",
+                                      "celaction",
+                                      "fusion",
+                                      "harmony",
+                                      "hiero",
+                                      "houdini",
+                                      "maya",
+                                      "nuke",
+                                      "photoshop",
+                                      "resolve",
+                                      "tvpaint",
+                                      "unreal"
+                                  ]
+                            },
+                            {
+                                "key": "tasks",
+                                "label": "Tasks",
+                                "type": "list",
+                                "object_type": "text"
+                            },
+                            {
+                                "type": "splitter"
+                            },
+                            {
+                                "type": "boolean",
+                                "key": "enabled",
+                                "label": "Enabled"
+                            }
+                        ]
+                    }
+                },
+                {
+                    "type": "list",
+                    "key": "open_workfile_tool_on_startup",
+                    "label": "Open workfile tool on launch",
+                    "is_group": true,
+                    "use_label_wrap": true,
+                    "object_type": {
+                        "type": "dict",
+                        "children": [
+                            {
+                                "type": "hosts-enum",
+                                "key": "hosts",
+                                "label": "Hosts",
+                                "multiselection": true,
+                                "hosts_filter": [
+                                    "nuke"
+                                ]
                             },
                             {
                                 "key": "tasks",
diff --git a/openpype/style/style.css b/openpype/style/style.css
index c57b9a8da6..b955bdc2a6 100644
--- a/openpype/style/style.css
+++ b/openpype/style/style.css
@@ -35,6 +35,10 @@ QWidget:disabled {
     color: {color:font-disabled};
 }
 
+QLabel {
+    background: transparent;
+}
+
 /* Inputs */
 QAbstractSpinBox, QLineEdit, QPlainTextEdit, QTextEdit {
     border: 1px solid {color:border};
@@ -97,7 +101,7 @@ QToolButton:disabled {
     background: {color:bg-buttons-disabled};
 }
 
-QToolButton[popupMode="1"] {
+QToolButton[popupMode="1"], QToolButton[popupMode="MenuButtonPopup"] {
     /* make way for the popup button */
     padding-right: 20px;
     border: 1px solid {color:bg-buttons};
@@ -340,6 +344,11 @@ QAbstractItemView {
     selection-background-color: transparent;
 }
 
+QAbstractItemView::item {
+    /* `border: none` hide outline of selected item. */
+    border: none;
+}
+
 QAbstractItemView:disabled{
     background: {color:bg-view-disabled};
     alternate-background-color: {color:bg-view-alternate-disabled};
diff --git a/openpype/tools/settings/settings/categories.py b/openpype/tools/settings/settings/categories.py
index 0aacd590db..8be3eddfa8 100644
--- a/openpype/tools/settings/settings/categories.py
+++ b/openpype/tools/settings/settings/categories.py
@@ -294,6 +294,7 @@ class SettingsCategoryWidget(QtWidgets.QWidget):
             msg = "<br><br>".join(warnings)
 
             dialog = QtWidgets.QMessageBox(self)
+            dialog.setWindowTitle("Save warnings")
             dialog.setText(msg)
             dialog.setIcon(QtWidgets.QMessageBox.Warning)
             dialog.exec_()
@@ -303,6 +304,7 @@ class SettingsCategoryWidget(QtWidgets.QWidget):
         except Exception as exc:
             formatted_traceback = traceback.format_exception(*sys.exc_info())
             dialog = QtWidgets.QMessageBox(self)
+            dialog.setWindowTitle("Unexpected error")
             msg = "Unexpected error happened!\n\nError: {}".format(str(exc))
             dialog.setText(msg)
             dialog.setDetailedText("\n".join(formatted_traceback))
@@ -392,6 +394,7 @@ class SettingsCategoryWidget(QtWidgets.QWidget):
         except Exception as exc:
             formatted_traceback = traceback.format_exception(*sys.exc_info())
             dialog = QtWidgets.QMessageBox(self)
+            dialog.setWindowTitle("Unexpected error")
             msg = "Unexpected error happened!\n\nError: {}".format(str(exc))
             dialog.setText(msg)
             dialog.setDetailedText("\n".join(formatted_traceback))
diff --git a/openpype/tools/settings/settings/window.py b/openpype/tools/settings/settings/window.py
index a60a2a1d88..4e88301349 100644
--- a/openpype/tools/settings/settings/window.py
+++ b/openpype/tools/settings/settings/window.py
@@ -94,7 +94,8 @@ class MainWidget(QtWidgets.QWidget):
         super(MainWidget, self).showEvent(event)
         if self._reset_on_show:
             self._reset_on_show = False
-            self.reset()
+            # Trigger reset with 100ms delay
+            QtCore.QTimer.singleShot(100, self.reset)
 
     def _show_password_dialog(self):
         if self._password_dialog:
@@ -107,6 +108,8 @@ class MainWidget(QtWidgets.QWidget):
         self._password_dialog = None
         if password_passed:
             self.reset()
+            if not self.isVisible():
+                self.show()
         else:
             self.close()
 
@@ -141,7 +144,10 @@ class MainWidget(QtWidgets.QWidget):
         # Don't show dialog if there are not registered slots for
         #   `trigger_restart` signal.
         # - For example when settings are runnin as standalone tool
-        if self.receivers(self.trigger_restart) < 1:
+        # - PySide2 and PyQt5 compatible way how to find out
+        method_index = self.metaObject().indexOfMethod("trigger_restart()")
+        method = self.metaObject().method(method_index)
+        if not self.isSignalConnected(method):
             return
 
         dialog = RestartDialog(self)
diff --git a/openpype/tools/standalonepublish/widgets/widget_component_item.py b/openpype/tools/standalonepublish/widgets/widget_component_item.py
index 186c8024db..de3cde50cd 100644
--- a/openpype/tools/standalonepublish/widgets/widget_component_item.py
+++ b/openpype/tools/standalonepublish/widgets/widget_component_item.py
@@ -1,7 +1,6 @@
 import os
 from Qt import QtCore, QtGui, QtWidgets
 from .resources import get_resource
-from avalon import style
 
 
 class ComponentItem(QtWidgets.QFrame):
@@ -61,7 +60,7 @@ class ComponentItem(QtWidgets.QFrame):
             name="menu", size=QtCore.QSize(22, 22)
         )
 
-        self.action_menu = QtWidgets.QMenu()
+        self.action_menu = QtWidgets.QMenu(self.btn_action_menu)
 
         expanding_sizePolicy = QtWidgets.QSizePolicy(
             QtWidgets.QSizePolicy.Expanding, QtWidgets.QSizePolicy.Expanding
@@ -229,7 +228,6 @@ class ComponentItem(QtWidgets.QFrame):
         if not self.btn_action_menu.isVisible():
             self.btn_action_menu.setVisible(True)
             self.btn_action_menu.clicked.connect(self.show_actions)
-            self.action_menu.setStyleSheet(style.load_stylesheet())
 
     def set_repre_name_valid(self, valid):
         self.has_valid_repre = valid
diff --git a/openpype/tools/workfiles/app.py b/openpype/tools/workfiles/app.py
index d567e26d74..42f0e422ae 100644
--- a/openpype/tools/workfiles/app.py
+++ b/openpype/tools/workfiles/app.py
@@ -693,16 +693,16 @@ class FilesWidget(QtWidgets.QWidget):
                 )
                 return
 
-        file_path = os.path.join(self.root, work_file)
+        file_path = os.path.join(os.path.normpath(self.root), work_file)
 
-        pipeline.emit("before.workfile.save", file_path)
+        pipeline.emit("before.workfile.save", [file_path])
 
         self._enter_session()   # Make sure we are in the right session
         self.host.save_file(file_path)
 
         self.set_asset_task(self._asset, self._task)
 
-        pipeline.emit("after.workfile.save", file_path)
+        pipeline.emit("after.workfile.save", [file_path])
 
         self.workfile_created.emit(file_path)