A spin off from MetaFont, and the original inspiration for
PyScript. You can do some really cool things with MetaPost, but
the scripting language is awkward.
GLE: Graphics Layout
Engine. Very similar in concept to Pyscript, but has it's own
scripting language that is close to Postscript. It uses
LaTeX-like expressions without actually using LaTeX. I got
fustrated with it and decided to write my own ;)
PYX: A very
similar project to pyscript. Some of the contructions are closer
to postscript than the object-orientation of pyscript. Well
worth checking out.