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Arduboy-homemade-package
Arduino IDE board package for Arduboy and homemade versions making things easy
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At least the core library seems to be BSD: https://github.com/Arduboy/Arduboy/blob/master/LICENSE
The pinout compatibility is public domain. The software is covered under it's respective licenses, the most popular library is now this: https://github.com/MLXXXp/Arduboy2 and is BSD. The name Arduboy is covered under US trademark. If you want to make your own clone, there are several out there already, you just can't use the trademark or include any games that carry it.
I made Tetris[0] on mine a few years back. Surprisingly, at almost the exact same time the Tetris MicroCard[1] was released, which was an officially licensed Tetris device based on the Arduboy. It was a crazy coincidence.
I still love my Arduboy! It's really fun to program on.
[0]: https://github.com/buzzert/Ardutris
[1]: https://tetris.wiki/Tetris_MicroCard