I'm faintly surprised that the Raspberry Pi hasn't made OS-experimentation more of a thing. There are: https://www.raspberrypi.com/news/risc-os-for-raspberry-

I'm faintly surprised that the Raspberry Pi hasn't made OS-experimentation more of a thing. There are: https://www.raspberrypi.com/news/risc-os-for-raspberry-pi/ https://www.raspberrypi.com/news/risc-os-for-raspberry-pi/ https://wiki.sugarlabs.org/go/Installation https://wiki.sugarlabs.org/go/Installation https://9p.io/wiki/plan9/Raspberry_Pi/index.html https://9p.io/wiki/plan9/Raspberry_Pi/index.html as well as a couple of RTOS options: https://all3dp.com/2/rtos-raspberry-pi-real-time-os/ https://all3dp.com/2/rtos-raspberry-pi-real-time-os/ and QNX: https://pidora.ca/qnx-on-raspberry-pi-the-professional-grade-os-you-didnt-know-you-needed/ https://pidora.ca/qnx-on-raspberry-pi-the-professional-grade... and TRON: https://www.tron.org/blog/2023/09/post-1767/ https://www.tron.org/blog/2023/09/post-1767/ (but that's only on the Pico? I'd love to see it as a desktop OS on an rPi5)