DocGen - Static website generator
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.
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.
Dr.Explain - Dr.Explain software is a help file authoring tool.
openSourceCM - Web-based legal document processing and contract management
HelpSmith - HelpSmith is a help authoring tool to create CHM HTML help files, manuals, and PDF documents.