GitHub + Slack Integration - Full visibility into your GitHub projects right inside Slack
Dr.Explain - Dr.Explain software is a help file authoring tool.
Stack Overflow Documentation - A crowdsourced developer documentation
Adobe RoboHelp - Adobe RoboHelp empowers organizations to deliver engaging help and policy content across mobile devices, formats, and platforms.
ask-stack - Get answers from Stack Overflow directly in the Atom editor
MadCap Flare - Documentation for Any Audience, Language or Format