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.

See also pstricks.

The author is Paul Gastin. The package is Copyright © 2006 Paul Gastin.