Try my Veusz plotting app and library - http://home.gna.org/veusz http://home.gna.org/veusz - it has a nice interactive GUI, is python scriptable and extensible

Try my Veusz plotting app and library - http://home.gna.org/veusz http://home.gna.org/veusz - it has a nice interactive GUI, is python scriptable and extensible via plugins. It's based around Python, Qt and numpy. It can export to PDF, EPS, SVG and bitmap formats.