Dr.Explain - Dr.Explain software is a help file authoring tool.
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.
Help & Manual - Help & Manual is a documentation authoring tool that allows you to create a single source text and convert it into a number of other target formats.
Document360 - Self-service knowledge base software focused on SaaS Products & Enterprise Software Projects.
HelpScribble - HelpScribble is a full-featured help authoring tool for easily creating professional Windows help files from start to finish.