http://code.google.com/p/vtr-verilog-to-routing/
http://mountains.ece.umn.edu/~kia/Download/tpr.html
http://www.doc.ic.ac.uk/~cyu/VPH/
http://brass.cs.berkeley.edu/links.html
http://www.eetimes.com/document.asp?doc_id=1317249
http://flextiles.eu/WordPress3/
https://sites.google.com/site/syedzahidahmed/