HelpNDoc - What is HelpNDoc ? Easy to use yet powerful help authoring environment which can generate various documentation formats from a single source.
wpDocs - wpDocs enables users to create step-by-step instructions with images and display them in minutes.
HelpSmith - HelpSmith is a help authoring tool to create CHM HTML help files, manuals, and PDF documents.
Manula - Manula is an online software for creating user manuals.
StepShot - Make knowledge sharing more time-efficient!
Doc-O-Matic - Doc-O-Matic is a software source code documentation and Help authoring tool.