Context Free Design Grammar
A very simple programming language for generating pictures
CFDG Online - PHP version of CFDG so you can try it online (111 visits)
http://korsh.com/cfdg/
Context Free - A GUI for CFDG for Mac OS X and Windows (74 visits)
http://www.ozonehouse.com/ContextFree/
Context Free Design Grammar - The original command line Unix version (72 visits)
http://chriscoyne.com/cfdg/