InkPlot is an extension (plugin) for the SVG Editor Inkscape to insert graphs from Gnuplot.
It allows you to
- preview the graph
- add it as SVG into Inkscape
- edit already generated graphs
- use a preamble file for reusable style and commands
- customize default settings in a config file
Gnupylot is a GUI for gnuplot (the widely used multi-OS plotting utility). It's written in Python using PyQt4 libraries. With Gnupylot you can save your plots (even the datasets). It's still in Alpha stage.
Sarvant (SAR Visual ANalysis Tool) is a python script that will analyze a sar file (from the sysstat utility, 'sar') and produce graphs using gnuplot of the collected data.