The sort of program that once set up, just ticks along without fuss or bother forever.
For me, as I’m replacing the vms today which I set up five years ago and haven’t needed to touch since;
- HAProxy
- KeepaliveD
Not easy to learn, but once they’re running, they both go on forever.
Vim because its everywhere and is super powerful. It can even be used for some light scripting. GCC to make my own programs. Python as well, same thing and also portable. All the programs that come with mint and become part of the background like the terminal emulator. All of it, pretty awesome. Jellyfin has been a mainstay as well.