CodePen - A front end web development playground.
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
Logpasta - Logpasta is a simple to use CLI-based application that allows you to paste your posts.
Teletype for Atom - Collaborate in real time in Atom