GitHub - mk6i/retro-aim-server: Self-hostable instant messaging server that makes classic AIM and ICQ clients work again. (Independently developed, not affiliated with or endorsed by AOL)
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Self-hostable instant messaging server that makes classic AIM and ICQ clients work again. (Independently developed, not affiliated with or endorsed by AOL) - mk6i/retro-aim-server

I just heard about RetroAIM. Which is a way to use AIM (AOL Instant Messanger) in the modern day, running your own servers.