PlantUml Dependency allows to parse / reverse engineering source files (only Java is supported by now) to generate a PlantUml description, allowing to draw the UML class diagram associated to the source code.
GnuConcept is a networking and colaborative mindmap tool for the creation
of complex documents. This program lets you draw the document concept map,
edit all the concepts content and export it to several formats (like
openoffice, dockbook and html)