Thanks to Klaus Darilion, QjSimple 0.6.3 works on most of desktop OS: Linux(es), Windows and Mac OS X.
It is a very handy application, especially for developers, but not olny, with simple UI and debugger window. A perfect replacement (for my very old good Linux testing tool) KPhone since QjSimple has SIMPLE presence support, tls ... more at: http://www.ipcom.at/index.php?id=560/
Cheers, Daniel