XNap provides a plugin enabled framework for peer-to-peer (P2P) applications and a client which is based on that framework. It is free software and licensed under the GNU Public License .
XNap is purely written in Java. The client features a modern Swing based user interface and console support that will run nicely on every platform with a recent Java Runtime Environment (1.3 or higher).
Operating system: Windows, Mac OS X, Linux
Download: XNap 2.5r3