Veusz is a GUI scientific plotting and graphing package. It
is designed to produce publication-ready Postscript or PDF
output. SVG, EMF and bitmap formats export are also supported.
The program runs under Unix/Linux, Windows or Mac OS X, and
binaries are provided. Data can be read from text, CSV or FITS
files, and data can be manipulated or examined from within the
application. 

WWW: http://home.gna.org/veusz/