1. The goal of Gajim is to provide a full featured and easy to use XMPP client. Gajim works nicely with GNOME, but does not require it to run. It is released under the GNU General Public License.
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  2. A Qt graphical user interface for Tox.
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  3. Chat, browse and transact securely in an open source community committed to bringing the power of Ethereum and a more distributed internet to your pocket.
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  4. Ekiga (formerly known as GnomeMeeting) is an open source SoftPhone, Video Conferencing and Instant Messenger application over the Internet. It supports HD sound quality and video up to DVD size and quality.

    Discontinued

    The project seems no longer developed. Last version, 4.0.1 stable and 5.0, released in 2013 and 2015, can be still downloaded from the official website

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  5. Kik is way more than just messaging. It’s the easiest way to connect with your friends, stay in the loop, and explore – all through chat. No phone numbers, just pick a username.
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  6. Digsby is a multiprotocol IM client that lets you chat with all your friends on AIM, MSN, Yahoo, ICQ, Google Talk, and Jabber with one simple to manage buddy list.

    Discontinued

    The application is not developed actively anymore. The source code has been made open for the community to take over but that didn't make any impact: https://github.com/ifwe/digsby | https://web.archive.org/web/20121205002331/http://blog.digsby.com/archives/1969/

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  7. Dialog Messenger is a customized self-hosted platform usable across multi operation systems simultaneously. dialog provides SDK tools for client interface as well as for server.
  8. Glip is instant messaging for teams and businesses to communicate and get work done at the same time. In Glip you work where your conversations are, so you always know what your team is doing and what needs to get done next.
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  9. Miranda New Generation is a successor of a popular multi-protocol instant messaging client for Windows - Miranda IM . Very light on system resources and extremely fast.
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    • FreeOpen Source
    • Mac
    • Windows
    • Linux
    • Online
    • Android
    • iPhone
    • Windows Phone
    • Self-Hosted
    is the open standard for messaging and presence. XMPP powers emerging technologies like IoT, WebRTC, and social.
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  10. Anonymous instant messaging for real privacy.

    Discontinued

    Last commit on GitHub is on August of 2017

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  11. Plus Messenger is an messaging app that uses Telegram 's API. Plus Messenger has all of Telegram's features plus themes. Plus Messenger is free for android devices.
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    • FreemiumProprietary
    • Online
    • Windows Mobile
    • Android
    • iPhone
    • Java Mobile
    • Symbian S60
    • HP webOS
    • Blackberry
    • Android Tablet
    • Windows Phone
    • iPad
    • Kindle Fire
    Chat everywhere! IM+ is the most widely used mobile IM app! Connect all-in-one to MSN, Yahoo!, Google Talk, AIM, Jabber, ICQ, Facebook, MySpace and Twitter on ALL popular mobile platforms.
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  12. Technitium Bit Chat is a secure, peer-to-peer (p2p), open source instant messenger designed to provide end-to-end encryption. It can be used over Internet and private LAN networks for instant messaging and file transfer.
    • FreeOpen Source
    • Mac
    • Windows
    • Linux
    • Hangouts
    What does it do: * Send/receive chat messages * Create/change conversations (rename, add people) * Leave/delete conversation * Notifications * Toggle notifications on/off * Drag-drop, copy-paste or attach-button for image upload.
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