1) Internet radio w/ an amplifier in a cigar box. It was a gift for my gf and only plays the station she listened to in college. https://github.com/rocktronica/curpi
2) Timed camera and GIF maker for my cat feeder. https://github.com/rocktronica/feedergif
3) OctoPrint server for my 3D printer http://octoprint.org/
[edit: formatting]