There are 2 repositories under unity-extension topic.
A categorized collection of awesome Unity open source on GitHub (800+)
You can start compiling without having to return focus to the Unity editor after changing the script.
Unity Attributes
【Unity】カスタマイズ可能なツールバーのエディタ拡張
Editor extension that allows you to customize the menu that appears when you right-click on Hierarchy.
【Unity】シンボルを簡単に定義できるエディタ拡張
UrGUI: easy to create GUI for Unity mods and debug
Editor extension that allows you to customize the menu that appears when you right-click on Project view.
【Unity】Transform の Inspector にリセットボタンを追加するエディタ拡張
F# integration for Unity
Stupid.UwU is a super easy to use library for Unity that enables you to make your scripts look as beautiful as ever WITHOUT having to write a custom editor.
Unity Scene Management
【Unity】スプライトの Border をコンテキストメニューから設定できるエディタ拡張
Editor extension to delete assets added with .unitypackage.
Sprite Mode が Multiple のテクスチャが持つ各スプライトの Inspector で border を編集できるようにするエディタ拡張
無料版の TexturePacker でパッキングしたテクスチャを Unity で使用できるようにするエディタ拡張
Unity Extensions
📜 Adds window to preference which allows you to customize default script templates in Unity.
Unity Attributes
Provides extensions to Unity's NativeArray that make using .NET's Span<T> with them easier.
【Unity】Git のコミットハッシュを管理するスクリプトを生成するエディタ拡張
You can easily use ReorderableList in Unity. This will improve the design and efficiency of the Unity editor extension!
Extension Method Library For Unity
Includes classes which add additional functionality to classes such as Vector2 to Unity.
Null Check Extension for Fluent Interfaces - Это расширение для C# предназначено для упрощения работы с объектами, которые могут быть null. Оно добавляет метод IfNotNull, который выполняет указанное действие на объекте, если он не null, и выводит предупреждение в консоль, если объект является null.
Unity Scene Management
Utility is a unity package containing Animator, Vector, List etc. extensions and handy functions to help developers.
Build Notification Tool for Unity
A Unity plugin that allows you to easily create editor windows from markup.