Andes 32-bit Risc-V core N22 is available for free testing and research. It is also possible to license it in volume.
The N22 is a configurable CPU with selectable support for interrupt, local memory, instruction cache, debugging and Arms open IP block bus AHB. The latter includes a number of standard peripheral cores to connect to AHB.
The core is small and the pipeline is just two steps, but it delivers 3.95 Coremark / MHz, which according to Andes, is best in its class.
To read more, please visit: http://www.etn.se/index.php/produkt/65898-andes-erbjuder-licenserad-risc-v.html. Please note that the original article is in Swedish.