1. Zebu is a secure and encrypted way to collaborate in the workplace. The Zebu platform is created with complete security encryption that will allow your business to simplify their work while protecting internal communication, storage, and scheduling.
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    • FreeOpen Source
    • Mac
    • Windows
    • Linux
    • BSD
    Tkabber is a Free and Open Source client for the Jabber instant messaging system. Its writen in Tcl/Tk, and works on many platforms (tested on Linux, FreeBSD, NetBSD, Solaris, MacOS X and Windows 98/2000/XP).
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  2. Coco Voice is a Walkie Talkie app to share voice, text, and pictures.
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    • FreeProprietary
    • Online
    • Android
    • iPhone
    • Symbian S60
    • Blackberry
    • Android Tablet
    • Windows Phone
    • iPad
    • Kindle Fire
    XMS. Unlimited messaging. Better. Free. • Free, real-time messaging for smartphones • Message any way you want – with text, pictures, videos, emoticons and more. Go beyond words. XMS takes messaging to the next level because: IT’S FREE
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    • FreeOpen Source
    • Mac
    • Windows
    • Linux
    • BSD
    emesene is an instant messenger capable of connecting to various networks and utilizing different graphical toolkits. Currently msn and jabber are supported through papyon and xmppy, which allows emesene to connect to various IM services such as GTalk, Facebook Chat, etc.

    Discontinued

    Development is dormant, but source code is available at Github. Last version, 2.12.9, released on September 06, 2012, can be still downloaded from the official website.

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  3. Olark comes with a wide range of features to help you customize and manage your live chat experience. Scroll down to see why Olark is super simple yet jam packed with customization, reporting and engagement functionality.
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    • FreeOpen Source
    • Online
    • Android
    • Android Tablet
    • Self-Hosted
    • Apple Messages
    Apple’s messaging network has gained a lot of popularity in recent years, though it has long been locked down to their platforms. But now, AirMessage makes it easy to send and receive messages to your friends and family through group chats, images, videos and audio messages!
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  4. Sipnetic is a free VoIP softphone based on the SIP protocol. Sipnetic supports voice and video calls, instant messages, presence information and end-to-end encryption.
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  5. QuteCom is a community of enthusiasts and developers, creating free software products related to communication over IP.

    Discontinued

    The official website is no longer available. Last version, 2.2.1, released in May 2011, can be still downloaded from Wayback Machine.

  6. Roger is the best way to talk with with friends and family. It’s a free walkie-talkie style app that connects you to anyone in your phone. Tap to talk, tap to listen - Talk with anyone in your phone, anytime, no matter where they are.

    Discontinued

    For a while now..

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  7. Quill is the best way to message with a team or group. Built for productivity and focus, Quill reduces notifications, collects conversations into threads, and gets out of your way — so you can get back to doing what you do best.
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  8. FireFloo is an instant messaging communicator combining the open XMPP standard (Jabber, GMail Chat etc.) with the echo protocol for multi-encrypted messaging. Use various methods to send chipertext over open standards like libgcrypt and encrypt your private communication.

    Discontinued

    The program is no longer updated. Last version, 1.0, released in February 2014, can be still downloaded from SourceForge.

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  9. Zoho Cliq simplifies your team communication with organized conversations, information that's easy to find and by connecting to the tools you love. Transform ideas into reality with your team. With channels, your team communication is visible, transparent and efficient.
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  10. QIP Infium is a multiprotocol instant messaging client. It supports ICQ (OSCAR), Jabber (XMPP), Mail.ru Agnet (MRA), IRC, XIMSS, SIP, Twitter, Facebook and other.

    Warning

    Potential Malware. Check comments.

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  11. AtomJump.com is a well tuned hosted version of the free open-source AtomJump.org. It is free to chat publicly with your family, group or co-workers on your own group.
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