GitHub Desktop - GitHub Desktop is a seamless way to contribute to projects on GitHub and GitHub Enterprise.
Dr.Explain - Dr.Explain software is a help file authoring tool.
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.
HelpSmith - HelpSmith is a help authoring tool to create CHM HTML help files, manuals, and PDF documents.
Mercurial SCM - Mercurial is a free, distributed source control management tool.
MadCap Flare - Documentation for Any Audience, Language or Format