[colejohnson66]

The HiFive Unmatched[0] from SiFive is a beast of a dev board, but with a price to match ($665 from Mouser). For a smaller Arduino-style board, the HiFive1 Rev B[1] exists as well, but it's more an MCU than CPU.

[0]: https://www.sifive.com/boards/hifive-unmatched

[1]: https://www.sifive.com/boards/hifive1-rev-b