Asterisk (PBX)

Asterisk is a free and open source framework for building communications applications. Asterisk is a software implementation of a telephone private branch exchange (PBX). It allows telephones interfac...
Language(s): C
Operating system(s): N/A
License: GNU General Public License v2

Ekiga

Ekiga (formely 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 qua...
Language(s): C, C++
Operating system(s): Unix, Linux, Windows
License: GNU General Public License

FreePBX

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 Licens...
Language(s): PHP
Operating system(s): Linux
License: AGPL v3 and GPL v3

FreeSWITCH

FreeSWITCH is designed to route and interconnect popular communication protocols using audio, video, text, or any other form of media. First released in January 2006, FreeSWITCH has grown to become th...
Language(s): C
Operating system(s): Linux, Mac OS, Solaris, FreeBSD, NetBSD, OpenBSD, DragonFly BSD, Windows
License: Mozilla Public License (MPL)

Jitsi

The world’s best video conferences are built on Jitsi. Jitsi is a set of open-source projects that allows you to easily build and deploy secure videoconferencing solutions. At the heart of Jitsi are J...
Language(s): Java
Operating system(s): Linux, Mac OS X, Windows
License: Apache License 2.0