Ekiga (formely known as GnomeMeeting) is an open source VoIP and video conferencing application for GNOME. Ekiga uses both the H.323 and SIP protocols. It supports many audio and video codecs, and is interoperable with other SIP compliant software and also with Microsoft NetMeeting.
Technitium Bit Chat is a secure, peer-to-peer (p2p), open source instant messenger designed to provide end-to-end encryption. ...
Jitsi (previously SIP Communicator) is an audio/video and chat communicator with full end-to-end encryption that supports prot ...
Skype is the most popular free voice-over IP and instant messaging service globally. It allows users to text, video and voice ...
Wire is a secure and private messenger for phones, tablets and desktop. Crystal clear voice and video calls, private group cha ...
csipsimple will allow native sip for android device.
It relies on the pjsip SIP stack and use the pjsip-jni project. The use o ...
TextSecure and RedPhone have been merged to create Signal! Using Signal, you can communicate instantly while avoiding SMS fees ...
Hangouts is a messaging app that lets you send and receive messages, photos and more, and even start free video and voice call ...
Zoiper IAX & SIP multilanguage and multiplatform (Windows, Linux and Mac OS X) softphone is a VoIP soft client, meant to w ...
Zoom, the cloud meeting company, unifies mobile collaboration, cloud video conferencing and simple online meetings into one ea ...
Riot (formerly Vector) is an opensource interoperable app running on Web, iOS and Android. It is built around chat rooms, both ...
With the rise of widespread government monitoring programs, Tox is an easy to use application that allows you to connect with ...
Instant messaging rooms for the distributed network IPFS
Ring positions itself as a potential free Skype replacement Open Source and cross-platform. Ring gives you a full control over ...
Linphone is an internet phone or Voice Over IP phone (VoIP). With Linphone you can communicate freely with people over the int ...