What are some alternatives?
HelpNDoc - What is HelpNDoc ? Easy to use yet powerful help authoring environment which can generate various documentation formats from a single source.
Readymag - Readymag is a comprehensive solution that allows you to design web publication, magazines, presentations, websites, and all the other publications.
WinCHM - Creating CHM file, Make CHM file, Web Help. WinCHM Pro - Help authoring software (CHM, WebHelp, DOC, PDF) . With this powerful tool you can not only create chm file from scratch, but also convert a set of existing HTML files to a chm file.
Zmags - Zmags provides solutions create and publish web experiences instantly.
Chmox - Chmox is a free (of charge), open source application for OS X which lets you read Windows Help...
SPIP - Système de Publication pour Internet