Open OSCAR Server revives AIM and ICQ with a self-hostable, open-source server

Open Oscar Server: open-source server compatible with AIM and ICQ clients

Open OSCAR Server is a self-hostable, open-source instant messaging server written in Go that brings classic AIM and ICQ clients back to life. It supports a wide range of legacy clients, from early AIM versions to ICQ 5, and includes features like buddy lists, chat rooms, file sharing, and user profiles. The project is independent and not affiliated with AOL, and it's under active development with community support.