diff --git a/openpype/hosts/aftereffects/__init__.py b/openpype/hosts/aftereffects/__init__.py
index e69de29bb2d..deae48d1229 100644
--- a/openpype/hosts/aftereffects/__init__.py
+++ b/openpype/hosts/aftereffects/__init__.py
@@ -0,0 +1,9 @@
+def add_implementation_envs(env, _app):
+    """Modify environments to contain all required for implementation."""
+    defaults = {
+        "OPENPYPE_LOG_NO_COLORS": "True",
+        "WEBSOCKET_URL": "ws://localhost:8097/ws/"
+    }
+    for key, value in defaults.items():
+        if not env.get(key):
+            env[key] = value
diff --git a/openpype/hosts/blender/__init__.py b/openpype/hosts/blender/__init__.py
index e69de29bb2d..4d932334497 100644
--- a/openpype/hosts/blender/__init__.py
+++ b/openpype/hosts/blender/__init__.py
@@ -0,0 +1,41 @@
+import os
+
+
+def add_implementation_envs(env, _app):
+    """Modify environments to contain all required for implementation."""
+    # Prepare path to implementation script
+    implementation_user_script_path = os.path.join(
+        os.environ["OPENPYPE_REPOS_ROOT"],
+        "repos",
+        "avalon-core",
+        "setup",
+        "blender"
+    )
+
+    # Add blender implementation script path to PYTHONPATH
+    python_path = env.get("PYTHONPATH") or ""
+    python_path_parts = [
+        path
+        for path in python_path.split(os.pathsep)
+        if path
+    ]
+    python_path_parts.insert(0, implementation_user_script_path)
+    env["PYTHONPATH"] = os.pathsep.join(python_path_parts)
+
+    # Modify Blender user scripts path
+    blender_user_scripts = env.get("BLENDER_USER_SCRIPTS") or ""
+    previous_user_scripts = []
+    for path in blender_user_scripts.split(os.pathsep):
+        if path and os.path.exists(path):
+            path = os.path.normpath(path)
+            if path != implementation_user_script_path:
+                previous_user_scripts.append(path)
+
+    env["OPENPYPE_BLENDER_USER_SCRIPTS"] = os.pathsep.join(
+        previous_user_scripts
+    )
+    env["BLENDER_USER_SCRIPTS"] = implementation_user_script_path
+
+    # Define Qt binding if not defined
+    if not env.get("QT_PREFERRED_BINDING"):
+        env["QT_PREFERRED_BINDING"] = "PySide2"
diff --git a/openpype/hosts/harmony/__init__.py b/openpype/hosts/harmony/__init__.py
index e69de29bb2d..8560fbaf4b6 100644
--- a/openpype/hosts/harmony/__init__.py
+++ b/openpype/hosts/harmony/__init__.py
@@ -0,0 +1,10 @@
+import os
+
+
+def add_implementation_envs(env, _app):
+    """Modify environments to contain all required for implementation."""
+    openharmony_path = os.path.join(
+        os.environ["OPENPYPE_REPOS_ROOT"], "pype", "vendor", "OpenHarmony"
+    )
+    # TODO check if is already set? What to do if is already set?
+    env["LIB_OPENHARMONY_PATH"] = openharmony_path
diff --git a/openpype/hosts/hiero/__init__.py b/openpype/hosts/hiero/__init__.py
index e69de29bb2d..1781f808e2d 100644
--- a/openpype/hosts/hiero/__init__.py
+++ b/openpype/hosts/hiero/__init__.py
@@ -0,0 +1,40 @@
+import os
+import platform
+
+
+def add_implementation_envs(env, _app):
+    # Add requirements to HIERO_PLUGIN_PATH
+    pype_root = os.environ["OPENPYPE_REPOS_ROOT"]
+    new_hiero_paths = [
+        os.path.join(pype_root, "openpype", "hosts", "hiero", "startup")
+    ]
+    old_hiero_path = env.get("HIERO_PLUGIN_PATH") or ""
+    for path in old_hiero_path.split(os.pathsep):
+        if not path or not os.path.exists(path):
+            continue
+
+        norm_path = os.path.normpath(path)
+        if norm_path not in new_hiero_paths:
+            new_hiero_paths.append(norm_path)
+
+    env["HIERO_PLUGIN_PATH"] = os.pathsep.join(new_hiero_paths)
+
+    # Try to add QuickTime to PATH
+    quick_time_path = "C:/Program Files (x86)/QuickTime/QTSystem"
+    if platform.system() == "windows" and os.path.exists(quick_time_path):
+        path_value = env.get("PATH") or ""
+        path_paths = [
+            path
+            for path in path_value.split(os.pathsep)
+            if path
+        ]
+        path_paths.append(quick_time_path)
+        env["PATH"] = os.pathsep.join(path_paths)
+
+    # Set default values if are not already set via settings
+    defaults = {
+        "LOGLEVEL": "DEBUG"
+    }
+    for key, value in defaults.items():
+        if not env.get(key):
+            env[key] = value
diff --git a/openpype/hosts/houdini/__init__.py b/openpype/hosts/houdini/__init__.py
index e69de29bb2d..8c12d13c813 100644
--- a/openpype/hosts/houdini/__init__.py
+++ b/openpype/hosts/houdini/__init__.py
@@ -0,0 +1,38 @@
+import os
+
+
+def add_implementation_envs(env, _app):
+    # Add requirements to HOUDINI_PATH and HOUDINI_MENU_PATH
+    pype_root = os.environ["OPENPYPE_REPOS_ROOT"]
+
+    startup_path = os.path.join(
+        pype_root, "openpype", "hosts", "houdini", "startup"
+    )
+    new_houdini_path = [startup_path]
+    new_houdini_menu_path = [startup_path]
+
+    old_houdini_path = env.get("HOUDINI_PATH") or ""
+    old_houdini_menu_path = env.get("HOUDINI_MENU_PATH") or ""
+
+    for path in old_houdini_path.split(os.pathsep):
+        if not path or not os.path.exists(path):
+            continue
+
+        norm_path = os.path.normpath(path)
+        if norm_path not in new_houdini_path:
+            new_houdini_path.append(norm_path)
+
+    for path in old_houdini_menu_path.split(os.pathsep):
+        if not path or not os.path.exists(path):
+            continue
+
+        norm_path = os.path.normpath(path)
+        if norm_path not in new_houdini_menu_path:
+            new_houdini_menu_path.append(norm_path)
+
+    # Add ampersand for unknown reason (Maybe is needed in Houdini?)
+    new_houdini_path.append("&")
+    new_houdini_menu_path.append("&")
+
+    env["HOUDINI_PATH"] = os.pathsep.join(new_houdini_path)
+    env["HOUDINI_MENU_PATH"] = os.pathsep.join(new_houdini_menu_path)
diff --git a/openpype/hosts/maya/__init__.py b/openpype/hosts/maya/__init__.py
index e69de29bb2d..549f100007a 100644
--- a/openpype/hosts/maya/__init__.py
+++ b/openpype/hosts/maya/__init__.py
@@ -0,0 +1,29 @@
+import os
+
+
+def add_implementation_envs(env, _app):
+    # Add requirements to PYTHONPATH
+    pype_root = os.environ["OPENPYPE_REPOS_ROOT"]
+    new_python_paths = [
+        os.path.join(pype_root, "openpype", "hosts", "maya", "startup"),
+        os.path.join(pype_root, "repos", "avalon-core", "setup", "maya"),
+        os.path.join(pype_root, "tools", "mayalookassigner")
+    ]
+    old_python_path = env.get("PYTHONPATH") or ""
+    for path in old_python_path.split(os.pathsep):
+        if not path or not os.path.exists(path):
+            continue
+
+        norm_path = os.path.normpath(path)
+        if norm_path not in new_python_paths:
+            new_python_paths.append(norm_path)
+
+    env["PYTHONPATH"] = os.pathsep.join(new_python_paths)
+
+    # Set default values if are not already set via settings
+    defaults = {
+        "OPENPYPE_LOG_NO_COLORS": "Yes"
+    }
+    for key, value in defaults.items():
+        if not env.get(key):
+            env[key] = value
diff --git a/openpype/hosts/nuke/__init__.py b/openpype/hosts/nuke/__init__.py
index e69de29bb2d..f1e81617e07 100644
--- a/openpype/hosts/nuke/__init__.py
+++ b/openpype/hosts/nuke/__init__.py
@@ -0,0 +1,43 @@
+import os
+import platform
+
+
+def add_implementation_envs(env, _app):
+    # Add requirements to NUKE_PATH
+    pype_root = os.environ["OPENPYPE_REPOS_ROOT"]
+    new_nuke_paths = [
+        os.path.join(pype_root, "openpype", "hosts", "nuke", "startup"),
+        os.path.join(
+            pype_root, "repos", "avalon-core", "setup", "nuke", "nuke_path"
+        )
+    ]
+    old_nuke_path = env.get("NUKE_PATH") or ""
+    for path in old_nuke_path.split(os.pathsep):
+        if not path or not os.path.exists(path):
+            continue
+
+        norm_path = os.path.normpath(path)
+        if norm_path not in new_nuke_paths:
+            new_nuke_paths.append(norm_path)
+
+    env["NUKE_PATH"] = os.pathsep.join(new_nuke_paths)
+
+    # Try to add QuickTime to PATH
+    quick_time_path = "C:/Program Files (x86)/QuickTime/QTSystem"
+    if platform.system() == "windows" and os.path.exists(quick_time_path):
+        path_value = env.get("PATH") or ""
+        path_paths = [
+            path
+            for path in path_value.split(os.pathsep)
+            if path
+        ]
+        path_paths.append(quick_time_path)
+        env["PATH"] = os.pathsep.join(path_paths)
+
+    # Set default values if are not already set via settings
+    defaults = {
+        "LOGLEVEL": "DEBUG"
+    }
+    for key, value in defaults.items():
+        if not env.get(key):
+            env[key] = value
diff --git a/openpype/hosts/photoshop/__init__.py b/openpype/hosts/photoshop/__init__.py
index e69de29bb2d..a91e0a65ff7 100644
--- a/openpype/hosts/photoshop/__init__.py
+++ b/openpype/hosts/photoshop/__init__.py
@@ -0,0 +1,9 @@
+def add_implementation_envs(env, _app):
+    """Modify environments to contain all required for implementation."""
+    defaults = {
+        "OPENPYPE_LOG_NO_COLORS": "True",
+        "WEBSOCKET_URL": "ws://localhost:8099/ws/"
+    }
+    for key, value in defaults.items():
+        if not env.get(key):
+            env[key] = value
diff --git a/openpype/hosts/tvpaint/__init__.py b/openpype/hosts/tvpaint/__init__.py
index e69de29bb2d..0e793fcf9f3 100644
--- a/openpype/hosts/tvpaint/__init__.py
+++ b/openpype/hosts/tvpaint/__init__.py
@@ -0,0 +1,8 @@
+def add_implementation_envs(env, _app):
+    """Modify environments to contain all required for implementation."""
+    defaults = {
+        "OPENPYPE_LOG_NO_COLORS": "True"
+    }
+    for key, value in defaults.items():
+        if not env.get(key):
+            env[key] = value
diff --git a/openpype/hosts/unreal/__init__.py b/openpype/hosts/unreal/__init__.py
index e69de29bb2d..1280442916a 100644
--- a/openpype/hosts/unreal/__init__.py
+++ b/openpype/hosts/unreal/__init__.py
@@ -0,0 +1,18 @@
+import os
+
+
+def add_implementation_envs(env, _app):
+    """Modify environments to contain all required for implementation."""
+    # Set AVALON_UNREAL_PLUGIN required for Unreal implementation
+    unreal_plugin_path = os.path.join(
+        os.environ["OPENPYPE_REPOS_ROOT"], "repos", "avalon-unreal-integration"
+    )
+    env["AVALON_UNREAL_PLUGIN"] = unreal_plugin_path
+
+    # Set default environments if are not set via settings
+    defaults = {
+        "OPENPYPE_LOG_NO_COLORS": "True"
+    }
+    for key, value in defaults.items():
+        if not env.get(key):
+            env[key] = value
diff --git a/openpype/lib/applications.py b/openpype/lib/applications.py
index c5c192f51bf..a44c43102f9 100644
--- a/openpype/lib/applications.py
+++ b/openpype/lib/applications.py
@@ -3,7 +3,6 @@
 import copy
 import json
 import platform
-import getpass
 import collections
 import inspect
 import subprocess
@@ -362,7 +361,6 @@ def launch(self, app_name, **data):
         context = ApplicationLaunchContext(
             app, executable, **data
         )
-        # TODO pass context through launch hooks
         return context.launch()
 
 
@@ -626,7 +624,7 @@ def __init__(self, application, executable, **data):
 
         # Logger
         logger_name = "{}-{}".format(self.__class__.__name__, self.app_name)
-        self.log = PypeLogger().get_logger(logger_name)
+        self.log = PypeLogger.get_logger(logger_name)
 
         self.executable = executable
 
@@ -1033,7 +1031,7 @@ def _merge_env(env, current_env):
     return result
 
 
-def prepare_host_environments(data):
+def prepare_host_environments(data, implementation_envs=True):
     """Modify launch environments based on launched app and context.
 
     Args:
@@ -1089,7 +1087,24 @@ def prepare_host_environments(data):
         # Merge dictionaries
         env_values = _merge_env(tool_env, env_values)
 
-    final_env = _merge_env(acre.compute(env_values), data["env"])
+    loaded_env = _merge_env(acre.compute(env_values), data["env"])
+
+    final_env = None
+    # Add host specific environments
+    if app.host_name and implementation_envs:
+        module = __import__("openpype.hosts", fromlist=[app.host_name])
+        host_module = getattr(module, app.host_name, None)
+        add_implementation_envs = None
+        if host_module:
+            add_implementation_envs = getattr(
+                host_module, "add_implementation_envs", None
+            )
+        if add_implementation_envs:
+            # Function may only modify passed dict without returning value
+            final_env = add_implementation_envs(loaded_env, app)
+
+    if final_env is None:
+        final_env = loaded_env
 
     # Update env
     data["env"].update(final_env)
diff --git a/openpype/settings/defaults/system_settings/applications.json b/openpype/settings/defaults/system_settings/applications.json
index 63d6da46337..020924db67a 100644
--- a/openpype/settings/defaults/system_settings/applications.json
+++ b/openpype/settings/defaults/system_settings/applications.json
@@ -5,18 +5,11 @@
         "icon": "{}/app_icons/maya.png",
         "host_name": "maya",
         "environment": {
-            "PYTHONPATH": [
-                "{OPENPYPE_REPOS_ROOT}/openpype/hosts/maya/startup",
-                "{OPENPYPE_REPOS_ROOT}/repos/avalon-core/setup/maya",
-                "{OPENPYPE_REPOS_ROOT}/repos/maya-look-assigner",
-                "{PYTHONPATH}"
-            ],
             "MAYA_DISABLE_CLIC_IPM": "Yes",
             "MAYA_DISABLE_CIP": "Yes",
             "MAYA_DISABLE_CER": "Yes",
             "PYMEL_SKIP_MEL_INIT": "Yes",
-            "LC_ALL": "C",
-            "OPENPYPE_LOG_NO_COLORS": "Yes"
+            "LC_ALL": "C"
         },
         "variants": {
             "2022": {
@@ -110,15 +103,7 @@
         "icon": "{}/app_icons/nuke.png",
         "host_name": "nuke",
         "environment": {
-            "NUKE_PATH": [
-                "{OPENPYPE_REPOS_ROOT}/repos/avalon-core/setup/nuke/nuke_path",
-                "{OPENPYPE_REPOS_ROOT}/openpype/hosts/nuke/startup",
-                "{OPENPYPE_STUDIO_PLUGINS}/nuke"
-            ],
-            "PATH": {
-                "windows": "C:/Program Files (x86)/QuickTime/QTSystem/;{PATH}"
-            },
-            "LOGLEVEL": "DEBUG"
+            "NUKE_PATH": "{OPENPYPE_STUDIO_PLUGINS}/nuke"
         },
         "variants": {
             "13-0": {
@@ -224,15 +209,7 @@
         "icon": "{}/app_icons/nuke.png",
         "host_name": "nuke",
         "environment": {
-            "NUKE_PATH": [
-                "{OPENPYPE_REPOS_ROOT}/repos/avalon-core/setup/nuke/nuke_path",
-                "{OPENPYPE_REPOS_ROOT}/openpype/hosts/nuke/startup",
-                "{OPENPYPE_STUDIO_PLUGINS}/nuke"
-            ],
-            "PATH": {
-                "windows": "C:/Program Files (x86)/QuickTime/QTSystem/;{PATH}"
-            },
-            "LOGLEVEL": "DEBUG"
+            "NUKE_PATH": "{OPENPYPE_STUDIO_PLUGINS}/nuke"
         },
         "variants": {
             "13-0": {
@@ -368,15 +345,8 @@
         "icon": "{}/app_icons/nuke.png",
         "host_name": "hiero",
         "environment": {
-            "HIERO_PLUGIN_PATH": [
-                "{OPENPYPE_REPOS_ROOT}/openpype/hosts/hiero/startup"
-            ],
-            "PATH": {
-                "windows": "C:/Program Files (x86)/QuickTime/QTSystem/;{PATH}"
-            },
             "WORKFILES_STARTUP": "0",
-            "TAG_ASSETBUILD_STARTUP": "0",
-            "LOGLEVEL": "DEBUG"
+            "TAG_ASSETBUILD_STARTUP": "0"
         },
         "variants": {
             "13-0": {
@@ -510,15 +480,8 @@
         "icon": "{}/app_icons/hiero.png",
         "host_name": "hiero",
         "environment": {
-            "HIERO_PLUGIN_PATH": [
-                "{OPENPYPE_REPOS_ROOT}/openpype/hosts/hiero/startup"
-            ],
-            "PATH": {
-                "windows": "C:/Program Files (x86)/QuickTime/QTSystem/;{PATH}"
-            },
             "WORKFILES_STARTUP": "0",
-            "TAG_ASSETBUILD_STARTUP": "0",
-            "LOGLEVEL": "DEBUG"
+            "TAG_ASSETBUILD_STARTUP": "0"
         },
         "variants": {
             "13-0": {
@@ -783,18 +746,7 @@
         "label": "Houdini",
         "icon": "{}/app_icons/houdini.png",
         "host_name": "houdini",
-        "environment": {
-            "HOUDINI_PATH": {
-                "darwin": "{OPENPYPE_REPOS_ROOT}/openpype/hosts/houdini/startup:&",
-                "linux": "{OPENPYPE_REPOS_ROOT}/openpype/hosts/houdini/startup:&",
-                "windows": "{OPENPYPE_REPOS_ROOT}/openpype/hosts/houdini/startup;&"
-            },
-            "HOUDINI_MENU_PATH": {
-                "darwin": "{OPENPYPE_REPOS_ROOT}/openpype/hosts/houdini/startup:&",
-                "linux": "{OPENPYPE_REPOS_ROOT}/openpype/hosts/houdini/startup:&",
-                "windows": "{OPENPYPE_REPOS_ROOT}/openpype/hosts/houdini/startup;&"
-            }
-        },
+        "environment": {},
         "variants": {
             "18-5": {
                 "use_python_2": true,
@@ -852,14 +804,7 @@
         "label": "Blender",
         "icon": "{}/app_icons/blender.png",
         "host_name": "blender",
-        "environment": {
-            "BLENDER_USER_SCRIPTS": "{OPENPYPE_REPOS_ROOT}/repos/avalon-core/setup/blender",
-            "PYTHONPATH": [
-                "{OPENPYPE_REPOS_ROOT}/repos/avalon-core/setup/blender",
-                "{PYTHONPATH}"
-            ],
-            "QT_PREFERRED_BINDING": "PySide2"
-        },
+        "environment": {},
         "variants": {
             "2-83": {
                 "use_python_2": false,
@@ -940,8 +885,7 @@
         "icon": "{}/app_icons/harmony.png",
         "host_name": "harmony",
         "environment": {
-            "AVALON_HARMONY_WORKFILES_ON_LAUNCH": "1",
-            "LIB_OPENHARMONY_PATH": "{OPENPYPE_REPOS_ROOT}/pype/vendor/OpenHarmony"
+            "AVALON_HARMONY_WORKFILES_ON_LAUNCH": "1"
         },
         "variants": {
             "20": {
@@ -985,9 +929,7 @@
         "label": "TVPaint",
         "icon": "{}/app_icons/tvpaint.png",
         "host_name": "tvpaint",
-        "environment": {
-            "OPENPYPE_LOG_NO_COLORS": "True"
-        },
+        "environment": {},
         "variants": {
             "animation_11-64bits": {
                 "use_python_2": false,
@@ -1034,8 +976,6 @@
         "host_name": "photoshop",
         "environment": {
             "AVALON_PHOTOSHOP_WORKFILES_ON_LAUNCH": "1",
-            "OPENPYPE_LOG_NO_COLORS": "Yes",
-            "WEBSOCKET_URL": "ws://localhost:8099/ws/",
             "WORKFILES_SAVE_AS": "Yes"
         },
         "variants": {
@@ -1084,8 +1024,6 @@
         "host_name": "aftereffects",
         "environment": {
             "AVALON_AFTEREFFECTS_WORKFILES_ON_LAUNCH": "1",
-            "OPENPYPE_LOG_NO_COLORS": "Yes",
-            "WEBSOCKET_URL": "ws://localhost:8097/ws/",
             "WORKFILES_SAVE_AS": "Yes"
         },
         "variants": {
@@ -1159,10 +1097,7 @@
         "label": "Unreal Editor",
         "icon": "{}/app_icons/ue4.png'",
         "host_name": "unreal",
-        "environment": {
-            "AVALON_UNREAL_PLUGIN": "{OPENPYPE_REPOS_ROOT}/repos/avalon-unreal-integration",
-            "OPENPYPE_LOG_NO_COLORS": "True"
-        },
+        "environment": {},
         "variants": {
             "4-26": {
                 "use_python_2": false,