jNabServer is a free and open-source utility that replaces the Violet platform with a Java based server that can be run locally on a server machine or even on some integrated platforms.
With jNabServer, you will be able to write plugin components, which handle requests sent by Nabaztag (button input, RFID input, audio recording etc.) and send back commands to play audio, move ears and flash the lights.
Detailed instructions on how to install and use the jNabServer utility on your Mac are available HERE.
jNabServer is cross-platform and it works on Mac OS X, Windows and Linux.