Neurocognitive Linguistics is an approach to linguistics developed by Sydney Lamb that uses relational networks to model what the brain actually does when it handles language. Neurocognitive Linguistics Lab ("NeuroLab" for short) is a program that allows you to experiment with relational networks using a convenient GUI and record the results of your experiments in tabular form.
Veusz is a scientific plotting package, designed to create publication-ready Postscript, PDF, or SVG output. It features an easy to use graphical interface as well as a command line interface and can be scripted or embedded in Python scripts. Graphs are constructed in a modular fashion from separate components. Datasets can be interactively modified or created from within the program.