HelpSmith - HelpSmith is a help authoring tool to create CHM HTML help files, manuals, and PDF documents.
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.
Adobe RoboHelp - Adobe RoboHelp empowers organizations to deliver engaging help and policy content across mobile devices, formats, and platforms.
MadCap Flare - Documentation for Any Audience, Language or Format
ClickHelp - Author, host and deliver docs across platforms and devices
Document360 - Self-service knowledge base software focused on SaaS Products & Enterprise Software Projects.