DocGen - Static website generator
HelpNDoc - What is HelpNDoc ? Easy to use yet powerful help authoring environment which can generate various documentation formats from a single source.
openSourceCM - Web-based legal document processing and contract management
Dr.Explain - Dr.Explain software is a help file authoring tool.
LogicalDOC - A document management system such as LogicalDOC can help your organization better manage business processes and put order in the chaos of documents every day run your business.
MadCap Flare - Documentation for Any Audience, Language or Format