Different parts of this repository have different licenses.
The hardware design (PCB, schematics, ...) is licensed under Creative Commons Attribution-NonCommercial-ShareAlike 4.0 International (CC BY-NC-SA 4.0).
The gateware design based on Litex is licensed under the same license as Litex, BSD 2-clause (bsd-2-clause), including additional Verilog.
The stand-alone software parts (including, but not limited to firmware, drivers, etc.) are licensed under the GNU General Public License v2.0 (gpl-2.0).
External repositories have their own licenses, see in each relevant repository.