Free and open-source library that improves unity inspector.
UniMob · 
Modern object-oriented reactive programming library for Unity. Inspired by MobX.
MVU/MVI/Redux like library for building declarative user interface in Unity. Built over UniMob. Inspired by Flutter.
Note
Examples can be found in the UniMob.UI Samples repository
AnimationPerformanceMesh-Animation - Fast GPU vertex shader based animation library for Unity;TextMeshProUITextMeshPro.SpriteAtlas.Support - Unity built-in SpriteAtlas to TextMeshPro SpriteAsset automated converter;TextMeshProUITMP Image - Script for drawing sprite from Text Mesh Pro atlases in UGUIUITutorialMaskForUGUI - UI Tutorial Mask is a component for highlighting specific objects over darkened background for Unity UI (uGUI)UniMobUIView-Binding - View binding library for Unity;UIStyle-Components - Library for styling game objects in Unity;UtilitiesExpression-Parser - Simple math expression parser library for Unity;MorpehECSMorpeh.Events - Events for Morpeh ECS;MorpehECSMorpeh.SystemStateProcessor - Reactivity for Morpeh ECS;EditorPackage-Symlinker - Utility that simplifies UPM package development;EditorNpmPublisherSupport - Publish Npm packages to your registry directly from the Unity;EditorSceneMaterialAnalyzer - Tool for analyzing materials and shaders used in scenesC#RoslynRequiredFieldsInit-Analyzer - C# 11 "Required Members" for Unity;