1. Whatsie is a simple & beautiful desktop client for WhatsApp Web. Chat without distractions on Windows, OS X and Linux.

    Discontinued

    Discontinued per notice on GitHub page: https://github.com/Aluxian/Whatsie

  2. A top-notch anonymous MESSENGER encrypted in blockchain. A Blockchain-based system for data and message transfers along with an integrated payment system are providing a truly fundamental benefits for all-personal and business-like communications.
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  3. QuickMSG is a secure messaging format and an Android App of the same name. With it you can send messages either to other contacts directly or to groups. Its aim is to combine the ease of use that messaging apps give with the security of encrypted email.
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    • FreeOpen Source
    • Mac
    • Windows
    • Linux
    • BSD
    Kadu is an open source Jabber/XMPP and Gadu-Gadu instant messenger client for Linux, *BSD, Mac and Windows.

    Discontinued

    Website is down. Latest commit 1ac3dfa on May 17, 2017. See https://github.com/vogel/kadu

  4. Safe Text® is a texting service that is built with state of the art technology to ensure your privacy and anonymity. We’ve removed all links between what you text, who you are and who you text.
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    • FreeProprietary
    • Android
    • Android Tablet
    Chat app for the Android platform using XMPP technology for the real time communication. Also includes strategies for the meaningful avatar motion generation and different avatar pose interpolations in a real-time. It also presents DTW algorithmic.
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  5. VIPole is a Secure Instant Messenger for secure messaging, encrypted voice/video calls, group chats that provides highly secure and strongly encrypted environment for all your communications and files you exchange over internet.
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    • FreemiumProprietary
    • Mac
    • Windows
    • Linux
    • Android
    • iPhone
    • Android Tablet
    • iPad
    • Kindle Fire
    Free live webcam video chat room software for multiple desktop platforms including mobile platforms like iOS and Android.
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  6. Messenger for WhatsApp™ (WA Messenger) is a wrapper for WhatsApp Web. It loads WhatsApp Web in toolbar popup UI and has badge icon text notification for all new conversations (even if toolbar popup is closed).
  7. MyChat is an instant messenger that works in LAN and over the Internet. Reliable in slow connections. Do not require too many system resources. The program has its own server where a user control everything happening in the chat.
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    • FreemiumProprietary
    • Mac
    • Windows
    • Windows Mobile
    • Android
    • iPhone
    • Java Mobile
    • Symbian S60
    • Blackberry
    Palringo is the lightweight Instant Messaging client for desktop computers. Express yourself in chat with emoticons and smileys to show your friends how you’re feeling. Send voice messages at the click of a button so your friends can hear your voice.
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  8. STAGE Cloud enables Unreal and Unity Enterprise professionals to instantly create, deploy and use their multi-user VR applications. STAGE Cloud requires only 3 simple steps to roll out multi-user VR applications. Further details: www.vr-on.cloud.
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  9. [Polish only] Comfortable and minimalistic multi-messenger. Allows you to communicate via XMPP, tlen and gadu-gadu protocol. Features avatars on every protocol. Develops in very quick way.

    Discontinued

    The project is no longer developed. Last stable version if from 21.05.2018, but they can be still downloaded from the official website.

  10. Collect all of those special little moments with the most important person in your life, in one app.
  11. Coccinella is a free and open-source cross-platform instant messaging client with a built-in whiteboard for improved collaboration with other people.

    Discontinued

    The last version 0.96.20 is from late 2010, but the software can still be downloaded from their website.

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