I don't know that I'd consider most of them "programs", but I've written hundreds of small helper scripts of various sorts over the years. Most of them aren't even published anywhere, not out of a desire to keep them from the light, but more because I write them, use them, and forget about them until they are rediscovered years (decades?) later.

One of the simpler scripts I wrote that I actually published is a little helper to output WiFi signal strength on Macs into printable glyphs so that you can include it in your prompts on the terminal.