CodeShare.io - Realtime code sharing for developers
Pastebin.com - Pastebin.com is a website where you can store text for a certain period of time.
Visual Studio Live Share - Real-time collaborative development
GitHub Gist - Gist is a simple way to share snippets and pastes with others.
Teletype for Atom - Collaborate in real time in Atom
hastebin - Pad editor for source code.