Documize - Enterprise-grade wiki and knowledge management platform
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.
Boardist - Personal workspace for all the data
Kchmviewer - Kchmviewer is a free, open-source CHM (MS HTML help) and EPUB viewer for Unix, Mac and Windows...
ReadTheDocs - Spend your time on writing high quality documentation, not on the tools to make your documentation work.
ExtraCHM - A fully featured reader for Compiled HTML (chm) documents.