Two things, working on more. VPN router and a doorbell to desktop-notifications box. I like listening to music on noise cancelling headphones sometimes when I work. I wouldn't hear the doorbell in that case, so I have a pi with a mic that sits close to the doorbell. If the noise level goes past a certain threshold for a few samples, it sends a command to my workstation where a script sits and triggers a desktop notification. Works pretty well with very few false positives and all "I might miss the package delivery guy" anxiety is gone while I enjoy music.