FastHelp - FastHelp is a Windows Help File Generator that produces online and offline documentation.
Dr.Explain - Dr.Explain software is a help file authoring tool.
StepShot - Make knowledge sharing more time-efficient!
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.
HelpSmith - HelpSmith is a help authoring tool to create CHM HTML help files, manuals, and PDF documents.
Document360 - Self-service knowledge base software focused on SaaS Products & Enterprise Software Projects.