GasTeX – Graphs and Au­tomata Sim­pli­fied in TeX

GasTeX is a set of LaTeX macros which en­able the user to draw graphs, au­tomata, nets, di­a­grams, etc., very eas­ily, in the LaTeX pic­ture en­vi­ron­ment.
The pack­age of­fers no doc­u­men­ta­tion (per se), but of­fers a cou­ple of ex­am­ple files in the dis­tri­bu­tion, and more on its home page.
GasTeX gen­er­ates its own PostScript code, and there­fore doesn't work di­rectly un­der PDFLaTeX.