Python Library
matplotlib
matplotlib is a python package for plotting. It is motivated by MATLAB.
Available on Fourierseq (ubuntu package : python-matplotlib)
See Gallery for the example. If you click each plot, you can see a python code to generate that plot.
numpy
numpy is a python library for numerical computing.
Available on Fourierseq (ubuntu package : python-numpy)
http://docs.scipy.org/doc/ (Documentation)