DEFT, the Development Environment For Tutorials, allows you to easily write and maintain tutorials which contain source code examples. If the code you're documenting changes, your examples in the tutorial will change as well.
Xuse manages requirements, use cases & other artefacts that drive software design. Xuse focuses on clear documentation & communication. It defines an XML data model for requirements & use cases with XSLT providing multiple derived views: HTML/SVG/PDF.
Note there is no GUI for entering requirements, however another project (https://sourceforge.net/projects/xguse/) will provide a GUI.
Agido is an extensible Agile Documentation Tool for Agile Development Projects. The documentation can be written in plain text in a wiki style markup and exported to different output formats such as PDF and HTML.
This is a maven plugin that takes an OpenOffice .odt text document based on an APT.ott style template and produces an maven APT (Almost Plain Text) document. Allows you to write maven site doucmentation in OpenOffice with spell checking and WYSIWIG.
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WikiJavadoc is an inline Documentation Tool which extends Wiki-Function to Gjdoc. Instead of manipulating the source code change the Java Documentation and write changes back to source, update Java Documentation.