TryCode - Realtime collaborative code editor (beta)
CodeKeep - Codekeep lets you store and share bits of code and text with other users. Snippets can be organized into folders/labels for instant reuse.
Codefile - Create collaborative code files & share it in real time
Anyfiddle - Build, run and share code in any language from your browser
CodeShare.io - Realtime code sharing for developers
CodeMyUI - Handpicked code snippets you can use in your web projects