Home projects. I've got a few that I use as Airplay receivers, Calibre OPDS book server, automatic updates and builds on my static sites, Twitter bots, HomeAssistant etc.
Super handy for anything that needs to run in the background without much supervision.
Hoping the stock increases soon as I've got a bunch of old displays I want to turn into digital picture frames.
I have one pretending to be a grandfather clock (it used drive a servo that rang a physical chime via a little motor driver controlled by GPIO, but the servos would burn out every year or so, now instead cron just plays some .ogg files of a clock striking). But for straight-up servers, wouldn't a bunch of docker containers (or even some shell scripts and cron) cover many of those other uses? I tend to think of the Pi as a sort of 'physical container' that gets me a full OS (with networking, package mgmt etc.) which can be great if you only need one thing in one place, but I also have a little fanless NUC-alike running a bunch of containers.
Super handy for anything that needs to run in the background without much supervision.
Hoping the stock increases soon as I've got a bunch of old displays I want to turn into digital picture frames.