Firefox OS aka B2G running on Rasppberry Pi
Instructions: https://wiki.mozilla.org/Hacking_b2g_on_Raspberry_Pi
Music: Sun Of A Rocket - KevinMacLeod
https://soundcloud.com/kevin-9-1
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https://www.youtube.com/watch?v=CCWtuhJCUm4
Edk2 Tinaocore UEFI bootloader has a stripped down qemu emulator available that can be enabled and allows efi drivers compiled for x86_64 to be run on arm hardware during boot time. This is a demonstration using the RX580 gpu to display boot menu.
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https://www.youtube.com/watch?v=oMM3rbn_hqw
Instructions to build it yourself: http://geektillithertz.com/wordpress/index.php/2016/05/09/kodi-on-raspberry-pi-open-source-gpu-driver-mesa-11/
Music: https://www.youtube.com/watch?v=__CRWE-L45k
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https://www.youtube.com/watch?v=EmmrQO6zNbo
Raspberry Pi Zero runs Raspbian and all your favourite applications, including Scratch, Minecraft and Sonic Pi.
BUY: https://www.raspberrypi.org/products/pi-zero/
Image courtesy:
raspberrypi.org
raspi.tv
raspberrypi.org/magpi
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https://www.youtube.com/watch?v=HTM-q_j-UOk