ManageEngine RecoveryManager Plus - RecoveryManager Plus is one such enterprise backup solution which has the ability to easily backup and restores both the domain controllers and virtual machines.

Documize - Enterprise-grade wiki and knowledge management platform

Heroku Enterprise - Heroku Enterprise is a flexible IT management for developers that lets them build apps using their preferred languages and tools like Ruby, Java, Python and Node.

ReadTheDocs - Spend your time on writing high quality documentation, not on the tools to make your documentation work.

Lastpass - LastPass is an online password manager and form filler that makes web browsing easier and more secure.

HackMD - Fast and flexible, real-time collaborative markdown, inspired by Hackpad.