The Sentient Toaster Project (aka RPi Smart Home)
My Raspberry Pi thinks it runs my home. It handles automation, security cams (mostly watching squirrels), and responds to voice commands (when it feels like it). Features include lights flickering rhythmically to my coding music.
A longer write-up is on the list, somewhere between “finish the thesis” and “tidy the desk”. In the meantime the links above do the talking.