asymptote

Powerful script-based vector graphics language

Asymptote is a powerful script-based vector graphics language that provides a natural coordinate-based framework for technical drawing. Labels and equations are typeset with LaTeX, for high-quality PostScript output. A major advantage of Asymptote over other graphics packages is that it is a programming language, as opposed to just a graphics program: it can therefore exploit the best features of script (command-driven) and graphical user interface (GUI) methods.