This is a port of ivtools, a collection of vector-graphic drawing editors
which augments the original idraw from Stanford University with mechanisms
for scripting, networking, animation, and graph-editing.  They also add
support for additional raster formats (PBM/PGM/PPM, PNG, GIF), arbitrary
PostScript (using pstoedit), and export/import via Unix filters.

WWW: http://www.ivtools.org/ivtools/