The Stanford University Unstructured (SU2) suite is an open-source collection of software tools
written in C++ for performing Partial Differential Equation (PDE) analysis and
solving PDE-constrained optimization problems.
The toolset is designed with computational fluid dynamics and aerodynamic shape optimization in mind,
but it is extensible (and has been extended) to treat arbitrary sets of
governing equations such as electrodynamics, chemically reacting flows, and many others.