icq

Rootshell Security Bulletin #22 from 1998 reports a major ICQ password verification bug allowing anyone to log in as any user by sending a password of 9+ characters, triggering a buffer overflow in the Mirabilis server.

Open Oscar Server is an open-source server written in Go that provides compatibility with classic AIM and ICQ instant messaging clients, supporting features like messaging, buddy lists, and chat rooms.

A guide on setting up a personal AIM server using Open OSCAR Server on Debian Trixie, covering installation, configuration, and firewall setup.