What are some alternatives?
MadCap Flare - Documentation for Any Audience, Language or Format
Adobe RoboHelp - Adobe RoboHelp empowers organizations to deliver engaging help and policy content across mobile devices, formats, and platforms.
Doxter - Software for creating, organizing and publishing project documentation
Airim - Show personalised FAQs before live chat
ClickHelp - Author, host and deliver docs across platforms and devices
Manula - Manula is an online software for creating user manuals.