I'll start. Did you know you can run a headless version of JD2 on a raspberry pi? It's not the greatest thing in the world, but sometimes its nice to throw a bunch of links in there and go to sleep.
If you have a large steam library, the rin forum has some tools to help backup a good chunk of those games. Usually you can't run a steam game without the steam client, but steamless and goldberg can make them run without needing the client.