There are a few, but there hasn't really been high enough performance SoCs/cores to make them worthwhile. Framework has a RISC-V based motherboard in the works,

There are a few, but there hasn't really been high enough performance SoCs/cores to make them worthwhile. Framework has a RISC-V based motherboard in the works, but it has less compute power than a Raspberry Pi 4 (JH7110) so it's of marginal use as an everyday machine. I think it will just take time, a lot of time, for RISC-V to get to the same spot that ARM is in now, but I am optimistic that it will get there.