1. Jitsi (previously SIP Communicator) is an audio/video and chat communicator with full encryption that supports protocols such as SIP, XMPP/Jabber, ICQ/AIM, Windows Live, Yahoo!, GTalk/Hangouts extensions, as well as OTR, ZRTP, etc.
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  2. Jami (formerly GNU Ring, SFLphone) positions itself as a potential free Skype replacement Open Source and cross-platform. Jami gives you a full control over your communications and an unmatched level of privacy.
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    • FreeOpen Source
    • Mac
    • Windows
    • Linux
    • Online
    • Windows Mobile
    • Android
    • iPhone
    • Android Tablet
    • Windows Phone
    • iPad
    • Xfce
    Linphone is one of the most famous open source softphones in the world. It is fully SIP-based, for all calling, presence and IM features. Use Linphone for free, and enjoy its intuitive interface and advanced features with our free SIP service or with an existing SIP account.
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  3. MicroSIP is a free portable SIP softphone for Windows based on PJSIP stack.
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  4. Empathy is a messaging program which supports text, voice, video chat, and file transfers over many different protocols. You can tell it about your accounts on all those services and do all your chatting within one application.

    Discontinued

    Empathy is currently unmaintained. Last version, 3.25, released in August 2017, can be still downloaded from the official website.

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  5. 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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    • FreeOpen Source
    • Mac
    • Windows
    • Linux
    Asterisk is free software that transforms a computer into a communication server. Asterisk lets you build applications like PBX, VoIP gateway, IVR and ACD.
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    • FreemiumProprietary
    • Mac
    • Windows
    • Linux
    • Online
    • Android
    • iPhone
    • Microsoft Exchange Server
    • Google Chrome
    • Microsoft Office Suite
    • Firefox
    3CXPhone is a free VoIP phone available for Windows, iPhone or any Android based smart phone such as Google Nexus, Sony Xperia, Motorola Droid or Samsung Galaxy.
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  6. FreePBX is a web-based open source GUI (graphical user interface) that controls and manages Asterisk (PBX), an open source communication server. FreePBX is licensed under the GNU General Public License (GPL), an open source license.
  7. Zoiper IAX & SIP multilanguage and multiplatform (Windows, Linux and Mac OS X) softphone is a VoIP soft client, meant to work with any IP-based communications systems and infrastructure.
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  8. csipsimple will allow native sip for android device. It relies on the pjsip SIP stack and use the pjsip-jni project. The use of this native library will ensure a better speed, call quality and less battery consumption than equivalent pure java projects.

    Discontinued

    Possibly discontinued. App hasn't been updated since November 30, 2014.

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  9. PhonerLite enables your PC to use it for internet telephony (VoIP , Voice over IP, SIP). You need an internet connection and an account from a provider supporting the SIP protocol.
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  10. Telephone allows you to make phone calls over the Internet or your company network. If your phone line supports SIP protocol, you can use it on your Mac instead of a physical phone anywhere you have a decent network connection.
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    • FreeOpen Source
    • Mac
    • Windows
    • Linux
    • Self-Hosted
    Wazo is mainly an IPBX that provides communication services such audio, video, and instant messaging based on the use of standard network technologies such as the TCP/IP protocol.
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  11. Kamailio® (successor of former OpenSER and SER) is an open source SIP server released under GPL, able to handle thousands of call setups per second.
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