Zulip开源群组聊天软件系统：zulip
zulip 服务器和客户端全面开源，均可以即装即用，适合企业群组通信，可以无缝集成软件开发所用的N多系统创业公司必备利器。
它拥有非常多的特性
Threaded group conversations
Talk about multiple topics at once without getting lost or overwhelmed.
One-on-one and group private conversations
Have private conversations with one or as many people as you need.
Persistence
We're always receiving messages for you, even when you're logged out.
History
Join a stream and see its history, so even new team members are never out of the loop.
Full-history search
Search is both snappy and smart, helping you look for text, people, and threads of conversation, with advanced search operators for fine-grained control.
Team presence and buddy list
See who is online at a glance.
Inline image, video, and tweet previews
Send a link and we'll automatically generate an inline preview.
Drag-and-drop file uploads
Drag a file into the compose box and we'll upload and preview it for you. Sharing and discussing work with teammates has never been easier.
@-notifications
Want someone's attention in a conversation? @-notify them and they'll be right over.
Stream-wide announcements
Use@allor@everyoneto get the attention of everyone in a stream.
Emails for important missed messages
If you're missing important conversations when you're away from Zulip, we'll send you an email summary so you're always in the loop.
Desktop notifications
Configurable for private and stream messages.
Audible notifications
So you don't miss important messages even when your eyes are elsewhere.
Hotkeys
Type as efficiently as you do in your favorite text editor.
Emoji
Sometimes it's the simple things in life, like being able to give a:thumbsup:while chatting.
Code
Discuss code, even multi-line code, with ease, including syntax-highlighting.
Lightweight markup
Get bulleted lists, clickable links, and nicely-formatted e-mail pastes automatically.
Message editing
Don't worry, you can always fix that typo.
Invite-only streams
Enjoy the benefits of threaded conversations while controlling your audience and privacy.
Starred messages
Keep a todo list or keep track of interesting conversations.
Integrations
Get alerts and updates from your favorite services with off-the-shelf integrations for Trac, Nagios, Github, Jenkins, and more.
API
Want to roll your own notifications? We've got a dead-simple RESTful API and Python bindings that will make integrations—both sending and receiving—a snap!
Mobile apps
Check Zulip on the go with native iOS and Android apps.
Desktop apps
Prefer Zulip in its own window and rich, OS-level notifications? Enjoy Zulip on your desktop.