JSDoc - An API documentation generator for JavaScript.
Dr.Explain - Dr.Explain software is a help file authoring tool.
GitBook - Modern Publishing, Simply taking your books from ideas to finished, polished books.
Adobe RoboHelp - Adobe RoboHelp empowers organizations to deliver engaging help and policy content across mobile devices, formats, and platforms.
Developerhub.io - All-in-One Platform for Online Documentation
MadCap Flare - Documentation for Any Audience, Language or Format