Wikimaps-Visualization is a project mainly written in JavaScript, it's free.
Display animated graph of a semantic network of Wikipedia articles using JS
Read a JSON File that is produced by https://github.com/mitcci/Wikimaps-Collector and display the animated graph using http://vis.stanford.edu/protovis/ . In the long term the visualization part should be ported to http://mbostock.github.com/d3/
Examples are online on: http://ickn.org/wikimaps/
Deploy the files to any webserver, no serverside frameworks are required. The JSON-Animation files tend to become rather large and the usage of gzip (mod_deflate etc.) is highly recommended.
index.html displays the animation, edit the elements in the
https://github.com/ret0