YARS
YARS - Yet Another Robot Simulator
A selection of creatures in action can be found here.
Other videos can be found here.
Third party files
Fonts
http://www.fontspace.com
Images
CBT.jpg - http://www.flickr.com/photos/stallio/3149911976/sizes/o/in/photostream/
wall.jpg - http://agf81.deviantart.com/art/Brick-Seamless-160259435
clouds.jpg - http://www.ode.org
wheel.jpg - source no longer available
wood2.jpg - source no longer available
ground.jpg - source no longer available