Documize - Enterprise-grade wiki and knowledge management platform
Time Doctor - Time Tracking and Time Management Software that is accurate and helps you to get a lot more done each day.
HackMD - Fast and flexible, real-time collaborative markdown, inspired by Hackpad.
Toggl - Toggl is an online time tracking tool. It features 1-click time tracking and helps you see where your time goes. Free and paid versions are available.
ReadTheDocs - Spend your time on writing high quality documentation, not on the tools to make your documentation work.
Hubstaff - Simple yet powerful employee work tracker with screenshots, timesheets, billing, in-depth reports, and more. Understand productivity issues and act on them.