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Rambox is a messaging and emailing app that combines common web applications into one. It gives you the possibility to add common services many times you need, all in one place. It's perfect for people who work with many services for business and private accounts.
Signal is a messaging app for simple private communication with friends. Signal uses your phone's data connection (WiFi/3G/4G) to communicate securely, optionally supports plain SMS/MMS to function as a unified messenger, and can also encrypt the stored messages on your phone.
Zimbra is the most capable open source email and collaboration suite available today. It provides support for Email, Shared calendar, Document management, Pop3, Address book and lot more. Mails could be tagged and search support is also provided. Zimbra is considered as an alternative to Microsoft Exchange Server.
Citadel is a collaboration suite (messaging and groupware). It provides support for Email, Calendaring/Scheduling, Address books, Bulletin boards, Mailing List Server, Instant Messaging, Wiki, Multiple domain support.
Caprine is an unofficial and privacy focused Facebook Messenger app with many useful features. It has support for Work Chat: Messenger for Workplace, You can send code blocks by using Markdown syntax. It is built with Electron framework.
If you are interested in a version of the Chat SDK that supports Firebase's new database please vote on this issue and help us meet our target on Patreon. We would love to work full time developing the open source. At the moment we have to spend a substantial amount of time doing other consulting work to cover our costs. If you like what we're doing and would like to support us to focus more of our time on the open source project we would be very grateful.
Aurora IMUI is a general IM UI components library, which does not depend on any specific IM SDK. This library provides common UI components such as MessageList, InputView. It supports common message type, such as text, image, audio, video, etc. By default it has several UI style for choice, and also supports style customization.
Openmeetings provides video conferencing, instant messaging, white board, collaborative document editing and other groupware tools using API functions of the Red5 Streaming Server for Remoting and Streaming. Meeting can be recorded and screen sharing support is also available.
It is a great solution for communities and companies wanting to privately host their own chat service or for developers looking forward to build and evolve their own chat platforms. Its features include File sharing, Video conferencing, Screen sharing, Live chat, Link preview and lot more.
With the rise of government surveillance programs, Tox, a FOSS initiative, aims to be an easy to use, all-in-one communication platform that ensures full privacy and secure message delivery. Tox must use UDP simply because hole punching with TCP is not as reliable. However, Tox does use TCP relays as a fallback if it encounters a firewall that prevents UDP hole punching.
Gitter is designed to make community messaging, collaboration and discovery as smooth and simple as possible. You can easily create, organise and grow your communities, inviting others to join just in one click. Gitter is an instant messaging and chat room system for developers and users of GitHub repositories. Gitter is similar to IRC and Slack. Unlike IRC, and like Slack, it automatically logs all messages in the cloud.
Riot is built on top of Matrix. Matrix is an open network for secure, decentralized communication delivering a community of users,bridged networks, integrated bots and applications plus full end-to-end encryption. Riot allows teams to communicate across a wide range of collaboration apps. If some team members use Riot while others use IRC, Slack or Gitter, Riot will allow these team members to seamlessly work together. Riot offers the richest network of communication bridges.
MongooseIM is aimed at large, complex enterprise level projects where real-time communication is critical for business success. It provides high availability, ease of deployment, development and reliability in production. MongooseIM can accept client sessions over vanilla XMPP, Websockets, and HTTP long-polling (a.k.a. BOSH).
ChatSecure is a instant messaging client for iOS and Android that integrates encrypted OTR ("Off the Record") messaging support from the libotr library and the XMPPFramework to handle Jabber/GTalk (XMPP).
Full breakdown is available on the features page. If you are interested in a version of the Chat SDK that supports Firebase's new database please vote on this issue and help us meet our target on Patreon.