I have 2 original Raspberry Pi model B. I used it for a short time as a Synergy server (keyboard/mice). My future plans for these are:

* PiHole (original model should be enough) * Home automation, ie Garage door opener / automation * CCTV monitoring using old webcam (not fast though, perhaps less than 5 fps but that's good enough for what I need) * CCTV recorder (not video, but just capturing photo every second, which is good enough for me) * file server for low throughput device (or TimeMachine server) * Server/PC status display (displays server status) on TV * Prometheus, htop, GoAccess, etc... * Lo-fi player * pivpn