www.conzilla.org

Conzilla2 - our second generation concept browser - is a knowledge management tool with many purposes. Among other things, it aims to be
an efficient collaborative knowledge environment / modeling tool.
a versatile interface for editing and styling RDF.
Conzilla presents knowledge in terms of specific maps, Context-maps. A Context-map displays nodes and arcs, from now on referred to as concepts and concept-relations, with specific box-forms, icons, arrow-heads, linestyles etc. To get an idea look at the screenshots below, click on them for full scale versions: