The Biopython Project - Freely available Python tools for computational molecular biology.
Pmv, ADT and ViPEr - Python software from the Molecular Graphics Lab (MGL) of the Scripps Research institute. [Free for non-commercial use]
pyCGNS - Python interface for CGNS (data standard for computational fluid dynamics). [Open Source, GPL]
PyDaylight - Turns the Daylight toolkit into a rapid application development system for chemical information by providing a full Python interface. [Open Source, LGPL]
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