UnityCsReference is the C# reference source code for the Unity engine and editor. It provides developers transparency into how Unity's C# APIs are implemented under the hood but is strictly for reference—not for modification or redistribution without a commercial license. The terms of use do not permit you to modify or redistribute the C# code (in either source or binary form). If you want to modify Unity's source code (C# and C++), contact Unity sales for a commercial source code license....
Snippetsource is a simple yet powerful repository to store code snippets or any other text content. SQLite is used as the database backend which makes fast indexed lookups possible.
WebSHi (Web Syntax Highlighter) is just another code syntax highlighting engine. Though it's written in JavaScript, WebSHi is very fast and scalable, can process 30,000+ lines of code in seconds even on slower browsers like IE6.