An open source software project delivering converged voice and data applications. The StarPound platform enables you to rapidly develop voice and data solutions using the power of business process modeling. More info: http://www.starpound.org.
Chabber is an extensible XMPP-based Instant Messaging application. It is a generic, portable application that follows the standard protocols for Instant Messaging and gives users a lot of advanced functionalities. It provides a platform for plugins.
Among the functionality: Include a large variety of codecs (G711, GSM, and SPEEX) - Protocol SIP - Other technical functionalities the support of DTMF (tonalities) although support ENUM (to employ numbers of SIP instead of the addresses of SIP).
Tata messenger is a Java-based instant message sending and receiving tool,most like the microsoft messenger and the Yahoo messenger ,and it will also provides the file transfer ,net meeting(video confrence,video transfer),and file sharing mechanisms
Soco is a distributed social software which based on the eclipse and P2P technique. Seco will facilitate the communication of people. Based on this platform, people can share file, BBS, chat, send email,play games, make friends and so on.