RISC-V

Open Source (BSD license) CPU. The RISC-V CPU going to production is a game changer for the Open Source Hardware community.

• Wikipedia: https://en.wikipedia.org/wiki/RISC-V
• GitHub: https://github.com/sifive
• Company: https://www.sifive.com/

Arduino like board using RISC-V processor:

• Specs: https://www.sifive.com/products/hifive1/
• Buy: https://www.crowdsupply.com/sifive/hifive1/

Raspberry Pi like board using RISC-V processor:

• Project: http://www.lowrisc.org/
• Buy: not available yet (as of 11/2017)