HelpSite - HelpSite is a simple service to help your setup the perfect support centre or help site.
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.
Support Hero - Educate your customers through self-help support
Kchmviewer - Kchmviewer is a free, open-source CHM (MS HTML help) and EPUB viewer for Unix, Mac and Windows...
Apervita - Apervita is a self-service platform that allows health enterprises and professionals to author evidence-based insight and connect it to practice, anywhere.
Microsoft HTML Help - Microsoft HTML Help is the standard help system for the Windows platform.