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.
Okular works so well at this point that I use it to annotate all my PDFs if I don’t explicitly need free-hand drawing (and xournalpp otherwise).