
Heap Explorer is a Memory Profiler, Debugger and Analyzer for Unity. You can open it from the main menu 'Window > Analysis > Heap Explorer'.
https://www.pkglnk.dev/heapexplorer.git 
PlayMode Inspector allows you to write EditorGUI code inside your MonoBehaviour classes to display it inside the dedicated PlayMode Inspector window. Open PlayMode Inspector from the Unity main menu under 'Window > Analysis > PlayMode Inspector.'
https://www.pkglnk.dev/playmodeinspector.git 
UI Culling for Unity allows to trigger OnBecameVisible & OnBecameInvisible events on uGUI widgets.
https://www.pkglnk.dev/uiculling.git 
The ScriptableObject Container package provides the ability to nest ScriptableObjects and work with them in a similar manner as Components. You can add a ScriptableObject to another ScriptableObject Container just like how you add a Component to a GameObject. On the scripting side, you retrieve ScriptableObjects from the Container in a similar way to how you retrieve Components from a GameObject.
https://www.pkglnk.dev/scriptableobjectcontainer.git 
Color Gradient Texture Import Pipeline allows you to generate gradient textures directly inside Unity.
https://www.pkglnk.dev/colorgradienttextureimportpipeline.git 