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Voice Chat Software
SIP Communicator is a cross-platform audio/video Internet phone and instant messenger that support some of the most popular instant messaging and telephony protocols such as SIP, Jabber, AIM/ICQ, MSN and soon others like Yahoo and IRC. SIP Communicator is completely Open Source / Free Software, and is freely available under the terms of the GNU Lesser General Public License. download page
OpenWengo is a cross-platform communication tool based on the SIP protocol, developed by the OpenWengo community and released under the GNU General Public License. It is more than just VoIP software: it is a full-fledged communications tool that lets you enjoy free calls, video conferencing, SMS, chat over many existing protocols (MSN, AIM/ICQ, Yahoo!, Jabber). download page
Ekiga 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. download page
Kiax is an IAX client application (a so called Softphone) which allows PC users to make ordinary VoIP calls to Asterisk servers, the same way as they do it with their hardware telephone. It aims to provide a simple and user-friendly graphical interface and desktop integration for calling, contact list, call register management and easy configuration. download page
