• FreeOpen Source
    • Mac
    • Windows
    • Linux
    • BSD
    An instant messaging application for Windows, Linux, and Mac OS X that connects to the free, open XMPP network.
  1. Kontalk is a secure instant messenger, allowing you to send and receive text, image and voice messages (other file types coming soon) to and from other Kontalk users completely free of charge. Kontalk Features: - Your phone number is your ID. No usernames or passwords.
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  2. Messenger for Desktop is a wrapper for the official client messenger.com. Therefore it works like a regular browser which can only navigate to the messenger.com web app. MFD doesn't touch your messages, account or personal data. All that is handled securely by Facebook.

    Bundleware

    Be careful during the installation: Forum

  3. aTalk is an XMPP client that supports the following features: * Instant messaging in plain text and End-to-End encryption with OMEMO or OTR * OMEMO encryption is available during multi-user group chat session, giving users maximum privacy and security * Supports both voice...
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  4. Love iMessage on your iPhone? You'll love it on your Mac, too. Messages lets you send unlimited messages to anyone on a Mac, iOS device, or Apple Watch.
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  5. The application is a push-to-talk (PTT) walkie-talkie for consumers and business and available for Android, iOS, Blackberry, Windows Phone, Windows PC, rugged mobile devices and two-way radios.
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  6. Messenger Lite is a fast and data-efficient messaging app to reach the people in your life. Installs quickly. It's less than 10MB to install, saving storage space on your phone. Saves data. It loads fast, runs efficiently and uses less mobile data.
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  7. Zero Knowledge, end-to-end encrypted collaboration tool for teams and businesses. Reviewable source code. Python wrapper for bots & integrations. Encryption white paper. Native offline mode. Faster file-sharing. Built for enterprise.
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  8. Kopete is an instant messenger supporting AIM, ICQ, Jabber, Gadu-Gadu, Novell GroupWise Messenger, and more. It is designed to be a flexible and extensible multi-protocol system suitable for personal and enterprise use.
  9. Antox is an Android client for Tox. It aims to bring the full multimedia support Tox offers to your device, although it's still currently in heavy development.
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  10. Off-the-Record (OTR) Messaging allows you to have private conversations over any instant messaging (MSN,Gtalk, Facebook and so on) by providing encryption, authentication, deniability, perfect forward secrecy
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  11. LAN Messenger is a p2p chat application for intranet communication and does not require a server. A variety of handy features are supported including notifications, personal and group messaging with encryption, file transfer and message logging.
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  12. eXo Platform is an all-in-one digital workplace solution that helps you connect, align and engage your teams around a single interface. You can use it to improve company and peer-to-peer communication, boost collaboration and manage company knowledge.
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  13. Instantbird is an instant messaging client based on Mozilla XULRunner and the open source library libpurple created by the software developers of Pidgin . Over 250 add-ons allow user customization of, and addition of, features.

    Discontinued

    Site last updated 2013. Site security certificate expired April 2017.

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  14. KakaoTalk is a phone number based messenger service that allows users anywhere in the world to chat one-to-one or in a group for free.
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