This article discusses on how data plotting can be improved. There are various programs out there, each has it's own pros and cons:
There have been various suggestions on the mailing lists about the feature a plotting program could have:
gwave requires an old guile-gtk for GTK1.2.
A rewrite of gwave:
Are there any programs out there that can show and postprocess simulation data? If yes, how can they be extended to work as a waveform viewer for the simulators (gnucap, ngspice)?
Some vague notes on how a new plotting application could be written. This notes currently relate on python as programming language.
Disadvantage: This configuration has a huge rucksack of additional required packages.
There are now some programs out there, that use the python, numpy, matplotlib tool chain: