XRVG
http://xrvg.rubyforge.org/

scoala

A high-level programming enviroment (Ruby) for vector graphics.

XRVG stands for "eXtended Ruby Vector Graphics". The purpose of this project is to define and implement a high-level and powerful programming environment for vector graphics generation.

an algorithmic vector library for ruby with idiosyncratic design principles (unit free?) and a recursive bent.