Jitsi – A Good Alternative to Skype
Jitsi is an audio/video Internet phone and instant messenger written in Java. It supports some of the most popular instant messaging and telephony protocols such as SIP, Jabber/XMPP (and hence Facebook and Google Talk), AIM, ICQ, MSN, Yahoo! Messenger. Secure video calls, conferencing, chat, desktop sharing, file transfer, support for your favorite OS, and IM network. All this, and more, in Jitsi – the most complete and advanced open source communicator.
The development of Jitsi started at the University of Strasbourg, France. Originally the project was known as SIP Communicator. Throughout the years our community has grown to include members and contributors from Brazil, Bulgaria, Cameroon, China, Estonia, France, Germany, India, Japan, Romania, Spain, Switzerland, UK, USA, and others. Jitsi is based on the OSGi architecture using the Felix implementation from Apache. This makes it very extensible and particularly developer friendly.