Code for Efficient Extensible Discretizations. (C, 2-clause BSD, GitHub)
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Simple finite element assemblers
Multiphysics Object Oriented Simulation Environment. (C++, LGPL 2.1, GitHub)
Computing platform for solving PDEs in Python and C++. (C++/Python, LGPL 3, GitHub/Bitbucket)
Framework for the numerical simulation of PDEs using unstructured discretizations. (C++, LGPL 2.1, GitHub)