Back in university, a friend and I built an old-school arcade. It as a wooden chest with an old PC inside running Linux. We then got the arcade buttons and joystick for 2 players, connected to the serial port, and wrote a Linux driver to understand the presses as a keyboard. We even added a coin door that accepted quarters. At the time, I was the president of the CompSci student body. We had a room in the university, where we placed the arcade. There were some great games between classes, and it gave us some funds for random small stuff (printer toners, etc.).
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Another one is https://shellshare.net. I use Linux for a while, and from time to time someone would ask my help with something. If you ever tried debugging a problem in someone's else terminal over the phone, you know how frustrating it can be. So I built it as a way to share a read-only stream of your terminal with a one-liner command.
It's been a while since I used it myself, but there are some people that use it for teaching in universities.
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