The article mmentions Moose, MFEM, OpenMC, but the really good stuff relevant for us nuclear physicist I would expect being talked about aren't mentioned: Bison, Transuranus, Marmot, Serpent, Vasp, Rattlesnake, Fispact.
On the open source open access side I'm missing Lammps or Geant4.
Moose & MFEM are great projects and important in itself, but not relevant in the nuclear physics domain. Software which is remains export-restricted for good reasons. Here a list for the curious mind:
On the open source open access side I'm missing Lammps or Geant4.