1)   HelpScribble 7.8.1
Full-featured, easy-to-use help authoring tool for creating WinHelp (.hlp), HTML Help (.chm), a printed manual and online documentation (on a web site) from the same source, from start to finish. Can import help files created with another tool.

 2)   HelpSmith 3.5.5.1
HelpSmith is a help authoring editor which lets you create CHM, Web Help, PDF, and Print Manuals without having to learn anything or code lots of HTML files. The product includes support for dynamic styles and many other useful features.

 3)   Loaris chm2web 1.0
Using chm2web (chm to html converter) you can convert documentation in the chm format (html help) into a full-featured browser-based platform-independent html help system that can be viewed in any modern web browser.