Rocket.Chat
开源聊天服务器，旨在替代WhatsApp。支持文本、语音和视频消息，实时视频和语音通话需外部供应商支持。提供Windows、Linux、Mac、Android和iOS客户端应用。
[Open source chatting server] (https://github.com/RocketChat/Rocket.Chat) , which aims to replace whats app.Support text messages, voice messages, video messages. Real time video and voice call need external vendor. With pairs of win/linux/Mac/android/ios client applications.