GPAW
A Python-oriented PAW electronic-structure code with plane-wave, real-space finite-difference and atomic-orbital representations, integrated with ASE.
Where it fits
Reproducible Python-driven studies of molecules, surfaces and periodic materials.
Limits and practical considerations
Method and hardware support differ by representation; GPU support is not universal across modes.
Licensing and access
GPL version 3 or later; PAW datasets and dependencies should also be checked.