A comprehensive and full-featured computational physics suite for boundary-element analysis of electromagnetic scattering, fluctuation-induced phenomena (Casimir forces and radiative heat transfer), nanophotonics, RF device engineering, electrostatics, and more. Includes a core library with C++ and python APIs as well as many command-line applications.
In general, it would be nice to have const-correctness throughout, with the key points being:
This would be nice to have over the long run, although certainly not a pressing concern.