What extensions have people made to gnuplot? Where can I get them?
Many extensions or patches are available on the “Patches” page of the gnuplot development site http://sourceforge.net/tracker/?group_id=2055&atid=302055. The current development version will generally include some of these being debugged for inclusion in a later official release of gnuplot. Older extensions, which may or may not work with the current version, are available from ftp.ucc.ie in /pub/gnuplot/contrib/. Some extensions available: • date-errorbar: allows dates in the hi/lo fields for errorbars. • perltk: A perl/tk canvas widget. • polyg.patch: Implements a polygon plotting style. • xgfe: graphical front end using the Qt widgets available at http://www.tug.org/tex-archive/graphics/gnuplot/contrib/. • Gnuplot.py: A python package to create graphs from within python. More information at http://gnuplot-py.sourceforge.net.