Here is an entertaining walkthrough from Christopher Barnatt on the ever-dependable “Explaining Computers” channel of a single-core RISC-V-based board with the same tiny dimensions as a Raspberry Pi Zero W <https://www.youtube.com/watch?v=-g18PMjjlcc>. Hardly a speed demon, but for the price, I think it represents amazing value. Also a clear indication that RISC-V is fulfilling its promise of being a serious competitor, or even a successor, to ARM.