pgf

TeX Portable Graphic Format
pgf stands for `portable graphics format'. It is a TeX macro package
that allows you to create graphics in your TeX documents using a
special pgfpicture environment and special macros for drawing lines,
curves, rectangles, and many other kind of graphic objects. Its usage
closely resembles the pstricks package or the normal picture
environment of LaTeX.
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Although pgf is less powerful than \pstricks, it has the advantage
that it can generate both PostScript output and pdf output from the
same file. The pgf package works together both with dvips and
pdftex. In particular, packages that rely on pdftex or pdflatex (like
some packages for creating presentations) can be used together with pgf.