There are more open source RISC-V that I can count on two hands. Off the top of my head: Rocket, Boom, Boom II, VexRiscv, Ri5cy, Ariane, Vectorblox, SERV, Swe

There are more open source RISC-V that I can count on two hands. Off the top of my head: Rocket, Boom, Boom II, VexRiscv, Ri5cy, Ariane, Vectorblox, SERV, Swerv EH1, Swerv EH2, picorv32, ...