Jabbin

Jabbin is a free chat program for instant messaging and VoIP phone calls via XMPP protocols.
It is the first XMPP client with VoIP in December 2005.
Features
Jabbin allows XMPP instant messaging and free voice calls. It is cross-platform with versions for Linux and Windows. A port to Mac OS X is in development.
Under the hood
The program is based on the Psi XMPP client. Both are written in and use the cross-platform Qt library to provide their user interface. Version 3.3.x of Qt is used so it's not very easy to build Jabbin on Windows using only open-source components. Either unofficial (but legal) Windows port for Qt 3.3.x/X11 needs to be used or Qt 3.3.x commercial license required)
Like Psi, Jabbin uses the XMPP communication protocol, but uses the libjingle library for peer-to-peer VoIP connections. Jabbin incorporates the libjingle support from Psi (where it was still considered experimental) with additional Windows support and uses the free voice codec Speex.
History
The first version, 1.0, was released in December 2005, based on the development Psi 0.10. The telephone connections were made via the TINS extension to XMPP.
Since version 2.0, VoIP support was backported from Psi and extended to work on Windows. It uses the libjingle library from Google, but does not (despite the confusing name) implement the Jingle protocol (Google Talk compatible) from the XMPP Standards Foundation. The support for this protocol replaced TINS.
For version 3, Jabbin plans to support videophone calls.
In 2009, the next version is still in development on the SVN.

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