What are some alternatives?
When comparing WinCHM and Helpinator, you can also consider the following products
HelpNDoc - What is HelpNDoc ? Easy to use yet powerful help authoring environment which can generate various documentation formats from a single source.
CHM Editor - Best solution to edit CHM files
Kchmviewer - Kchmviewer is a free, open-source CHM (MS HTML help) and EPUB viewer for Unix, Mac and Windows...
MadCap Flare - Documentation for Any Audience, Language or Format
Chmox - Chmox is a free (of charge), open source application for OS X which lets you read Windows Help...
Adobe RoboHelp - Adobe RoboHelp empowers organizations to deliver engaging help and policy content across mobile devices, formats, and platforms.