All for FREE - Visit the website to get the details here
Bless Nintendo for making the Wii controller: inexpensive, lots of internal sensor data (motion sensing, tilt sensing, buttons), elegant design, and standard Bluetooth support allowing it to be used with Mac, Windows, and Linux.
Now there’s free and open source software for making the most of your Wiimote as a musical instrument. First up: Wiinstrument, a multi-purpose percussion instrument, now available for all three operating systems (a Windows version was recently added).
Plays percussion / drums with gestures
Use an (in-development) internal sampler with WAV files, or trigger other software via MIDI
Use tilt for control changes
Supports tilt, velocity (how much force you use when you move your Wiimote), with acceleration from both the Wiimote and nunchuk
It works with Mac, Windows, and Linux, via a standard OpenGL-based interface, thanks to the awesome 2D OpenGL library Gosu. (Programmers, take note.)
Of course, drums are just the beginning — you could use this to trigger clips, grooves, visualist videos and animations, whatever. And it comes with demos, tutorials, source code, the lot.