Neuromorphics are a big one that will soon have a large presence. This also sort of encompasses tensor units and other AI specific hardwares. Maybe take a look at ASICs and unconventional computing.

That’s definitely not it but it’s very difficult to find research (especially ongoing research is very rare) or even information on alternatives to the currently dominant (due to monopoly) von Neumann, binary, register machine, instruction-set-having, etc architectures.

You might try looking into dataflow, logic-based (like computers that do Prolog), or transport-triggered architectures. Or Lisp machines too.