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

Open OSCAR Server is a Golang-based, MIT-licensed instant-messaging server that works with classic AIM (v1-7) and ICQ (98x-5) clients, supporting features such as away messages, buddy icons, chat rooms, file sharing, privacy controls, and user directory search. It includes a RESTful Management API with example PowerShell and curl commands for creating, deleting, and updating users, managing sessions, and handling public chat rooms.