Dr.Explain - Dr.Explain software is a help file authoring tool.
GitHub Desktop - GitHub Desktop is a seamless way to contribute to projects on GitHub and GitHub Enterprise.
Adobe RoboHelp - Adobe RoboHelp empowers organizations to deliver engaging help and policy content across mobile devices, formats, and platforms.
Git - Git is a free and open source version control system designed to handle everything from small to very large projects with speed and efficiency. It is easy to learn and lightweight with lighting fast performance that outclasses competitors.
MadCap Flare - Documentation for Any Audience, Language or Format
Mercurial SCM - Mercurial is a free, distributed source control management tool.