Python
Python is an open-source and dynamic object-oriented programming language. It offers strong support for integration with other languages and tools and efficiency in memory management. More details can be found here.
NumPy
NumPy is open-source software for mathematics and dealing with arrays under python. More details can be found here.
SciPy
SciPy is open-source python-based software for mathematics, science, and engineering. More details can be found here.
Matplotlib/Pylab
Matplotlib is a python plotting library which produces publication quality figures in a variety of hardcopy formats and interactive environments across platforms. More details can be found here.
Madagascar
Madagascar (formerly known as RSF) is an open-source software package for geophysical data processing and reproducible numerical experiments.More details can be found here.