Wgraph
From FollowTheScore
wgraph : A universal wiki graph generator
wgraph relies on a graph drawing software called "aiSee". aiSee is free for academic use and can be downloaded from [1]. aiSee is a brilliant product and came out of research results of the University of Bremen and Saarbrücken, Germany, one decade ago.
wgraph integrates aiSee into a mediawiki environment. The syntax you use is basically the "GDL" - notation of aiSEE -- the "Graph Description Language". For use within mediawiki the syntax has been somewhat simplified and enhanced -- resulting in a "mediawiki graph description language" which will be referred to as "MGDL" in the following.
{{#wgraph: name=tmp | gdl | node x {} }}