Comment by yjftsjthsd-h

Mesa:

There are official freebsd packages of mesa: https://ports.freebsd.org/cgi/ports.cgi?query=mesa-&stype=al...

In fact, https://doc.redox-os.org/book/graphics-windowing.html seems to imply that redox is or plans to use mesa.

Android:

Okay, that's fair; termux already proved that GNU on Android is viable.