FreeRouting interactive push & shove router
Works with FreePCB, KiCad, gEDA, CadSoft-Eagle and other PCB design software with an interface to the Specctra or Electra autorouter.
Developed by Alfons Wirtz and open sourced under GPLv3 license.
The Freerouting project is now open source http://www.freerouting.net/fen/viewtopic.php?f=4&t=255
Website link http://www.freerouting.net/