FastHelp - FastHelp is a Windows Help File Generator that produces online and offline documentation.
Intercom - Intercom is a customer relationship management and messaging tool for web businesses. Build relationships with users to create loyal customers.
StepShot - Make knowledge sharing more time-efficient!
HelpSite - HelpSite is a simple service to help your setup the perfect support centre or help site.
HelpNDoc - What is HelpNDoc ? Easy to use yet powerful help authoring environment which can generate various documentation formats from a single source.
Manula - Manula is an online software for creating user manuals.