These got me into programming and I made a couple of my own that are now completely lost to time.
ccoms (chat commands) were my favorite. The program would scan the chat and when you sent a command, it'd do whatever you asked and send a response back to the chat for everyone to see. Basically turning the AOL chat into a public command line. One of the more popular things people used it for was for playing pirated music. You'd send `play rammstein` to the chat, and it'd start playing a random Rammstein song from your mp3 collection.
I started writing one later[1], although I haven't touched it since 2016. It'd connect to your spotify account, instead.
Also, it seems Mark Zuckerberg was in the scene. He apparently wrote Darth Phader (a fader.) A fader would make your text in chats fade colors by injecting html to change the text color between each character. So, your text would start blue and fade to red further along in the message, then maybe go back to blue, it was all configurable in most of them.
Edit: I can't believe I left this out, but there's also a facebook group[2], Justin has a site with a lot of content about progs[3], and I recently stumbled on the AOL Underground Podcast[4].
[0]: https://progs.rexflex.net/
[1]: https://github.com/RexMorgan/qwik-tools
[2]: https://www.facebook.com/groups/297526060414740/