What are some alternatives?
MadCap Flare - Documentation for Any Audience, Language or Format
HelpSmith - HelpSmith is a help authoring tool to create CHM HTML help files, manuals, and PDF documents.
Adobe RoboHelp - Adobe RoboHelp empowers organizations to deliver engaging help and policy content across mobile devices, formats, and platforms.
HelpNDoc - What is HelpNDoc ? Easy to use yet powerful help authoring environment which can generate various documentation formats from a single source.
KEL CHM Creator - KEL CHM Creator a is flexible, powerful and free (freeware) CHM creator that uses Microsoft® HTML Help Workshop to combine your HTML files into one compressed and compact CHM (Compiled Help Modules…
Doxter - Software for creating, organizing and publishing project documentation