CmapTools : The IHMC CmapTools program empowers users to construct, navigate, share and criticize knowledge models represented as concept maps.
WikkaWiki : WikkaWiki is a flexible, standards-compliant and lightweight wiki engine written in PHP, which uses MySQL to store pages.
TheBrain : TheBrain is a mind mapping and personal knowledge base software
FreeMind : FreeMind is a premier free mind-mapping software written in Java.
Visual Understanding Environment : The Visual Understanding Environment (VUE) is an Open Source project based at Tufts University. The VUE project is focused on creating flexible tools ...
Conzilla2 - our second generation concept browser - is a knowledge management tool with many purposes.
