That’s neat. I’m curious about what all the phones are running?

Freespace 2 comes to mind. The whole game engine was open source not just the game itself. Looks like there is still a community building on it too. https://scp.indiegames.us/

1961 Gibson Discoverer Amp. Found it in the basement as a teen. Replaced the fuse holder and fuse. Powered up all the tubes no problem and still running strong today.