Yes, but compared to RISC-V neither OpenSPARC nor OpenPOWER are really going anywhere. Not really sure why, maybe the lawyers read the fine print about the level of openness they actually provide and decide that nope, not gonna touch that one?

Technically just looking at the ISA both SPARC and POWER seem fine enough. So why is nobody interested?

(Talos is interesting but not really an answer to the question, as it seems to be focused on building affordable-ish systems around an existing CPU, not developing new CPU's.)