pgf -- A Portable Graphic Format for TeX
PGF is a macro package for creating graphics. It is platform-
and format-independent and works together with the most important
TeX backend drivers, including pdftex and dvips. It comes with
a user-friedly syntax layer called TikZ.
Its usage is similar to pstricks and the standard picture
environment. PGF works with plain (pdf-)TeX, (pdf-)LaTeX, and
ConTeXt. Unlike pstricks, it can produce either PostScript or PDF output.
The material in base/ is by the author of the pgf package.
The material in contrib/ is by various authors, not necessarily
associated with the authors of the base material.