A while ago I made a version of the old computer art language Mini-Explor. It’s a library or domain specific language in Fortran. I’ve tidied the code up a little and added it to my source repository here –

http://robmyers.wpengine.com/git/?p=explor.git;a=summary

You can get it using git –

git clone https://robmyers.wpengine.com/git/explor.git

For more information on Explor, see –

http://portal.acm.org/citation.cfm?id=807020

http://portal.acm.org/citation.cfm?id=988052