The default ringtone in LineageOS, but I use talk.wav from Quake (1996) for notifications, I love that sound

The ring, when I was 11. I was scared for years

I’d love to see more studios make puzzle-adventure games, like the ones by Cyan

I’d say ffmpeg is a good example, it’s used by almost every piece of software that has to manipulate audio or video (including messaging applications), yet not many people know about its existance.