* [JuggleIM v1.8.16](https://github.com/juggleim/im-server) – High-performance instant messaging backend providing protobuf and WebSocket long-connection delivery with reliable storage and multi-tenant support.

* [Beaver IM v2.1.1](https://github.com/wsrh8888/beaver-server) – Go-Zero-based IM server providing REST, WebSocket, and gRPC services with OAuth JWT, database storage, and real-time audio/video support.