Anologue - Disposable online chat.
Documize - Enterprise-grade wiki and knowledge management platform
Smarsh Instant Messenger - smarshIM Mobile is a free application download that requires a paid account on the smarshIM service...
HackMD - Fast and flexible, real-time collaborative markdown, inspired by Hackpad.
Meet in Chat - Meet new people. Have fun sharing photos.
ReadTheDocs - Spend your time on writing high quality documentation, not on the tools to make your documentation work.