What forms can energy take?

It seems like whenever we talk about "released" energy the assumed form of that energy is electromagnetic radiation. Is it possible for "energy" that appears in any theory or process to exist in any form that is not:

1. A photon, or
2. A particle with non-zero mass, or
3. Embodied in the relationship between massive particles with respect to some "fundamental force" (i.e., nuclear force binding, or space-time relative position or velocity)
• Is potential energy allowed? – David White Jul 13 '17 at 18:35
• You leave only gravitational interaction :-) – LLlAMnYP Jul 13 '17 at 18:37
• @DavidWhite - Yes, I assume potential energy (including gravitational) would be encompassed in #3. – feetwet Jul 13 '17 at 18:46