The first release of MyViz is available for Windows, Linux and Mac OS X, 32 or 64 bits version for each platform !
You can download it here:
Remember that MyViz can be considered as a desktop version of Freeboard, allowing things that are not possible for a Web application. For example, communicating with the serial port.
So, the very first example shows how to communicate between MyViz and an Arduino Uno:
Enjoy, and don't hesitate to ask if you have any question or problem !