GitHub repository: letscubo/Open-IM-Server
Description: OpenIM: Instant messaging open source project based on go built by IM technology experts. Backend in Go.（由IM技术专家打造的基于 Go 实现的即时通讯（IM）项目，从服务端到客户端SDK开源即时通讯（IM）整体解决方案，可以轻松替代第三方IM云服务，打造具备聊天、社交功能的app。）