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Jami (formerly GNU Ring, SFLphone) is a SIP-compatible distributed peer-to-peer softphone and SIP-based instant messenger for Linux, Microsoft Windows, macOS, iOS, and Android.
FreeSWITCH is a free and open-source telephony software for real-time communication protocols using audio, video, text and other forms of media. The software has applications in WebRTC, voice over Internet Protocol (VoIP), video transcoding, Multipoint Control Unit (MCU) functionality and supports Session Initiation Protocol (SIP) features.
Blink is based on the Session Initiation Protocol, and beyond voice over IP, its features also include video, instant messaging, file transfer and multi-party conferencing sessions based on MSRP protocol, remote desktop sharing using RFB protocol (VNC), and SIMPLE presence using XCAP protocol.
OPAL implements a wide range of Voice over IP (VoIP) protocols for voice, video and fax data over IP networks. It is written in C++ and released under the Mozilla Public Licence. OPAL utilises the PTLib portable library that allows OPAL to run on a variety of platforms including Unix/Linux/BSD, MacOSX, Windows, Windows mobile and embedded systems.
Jitsi, a Java VoIP and Instant Messaging client with ZRTP encryption, for FreeBSD, Linux, OS X, Windows; LGPL Linphone , with a core/UI separation, the GUI is using Qt libraries, for Linux, OS X, Windows, and mobile phones (Android, iPhone, Windows Phone, BlackBerry)
Gajim / ɡ ɛ ˈ ʒ iː m / [4] is an instant messaging client for the XMPP protocol which uses the GTK toolkit. The name Gajim is a recursive acronym for Gajim's a jabber instant messenger.
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MicroSIP is a lightweight, open-source software application that enables users to make Voice over IP (VoIP) calls using the SIP (Session Initiation Protocol) standard. It is designed to be simple, easy to use, and resource-efficient, making it an ideal choice for low-resource devices, such as older computers, and for users who need a minimalistic VoIP client.