I have a few toy utility apps that I run 24/7 on cloud infrastructure. One example is PicoShare, a simple web app that makes it easy for me to share files with friends and teammates.
There are several convenience apps I would run if it were easy to run them constantly. But there’s enough friction to running even a simple app 24/7 that I don’t do it.
In the past, I’ve tried running toy apps on my home server.