Chronos-theremin is a (lousy named) Python script for using TI Chronos watch (wiki) as a MIDI controller under Linux. It can also be modified for any other serial device providing usable (preferably accelerometar data) output.
Chronos-theremin is released under GPLv3 licence.
Chronos-theremin can be downloaded from http://hyperglitch.com/files/chronos-theremin.tar.gz
To run it you need to have installed PyQt4, PySerial and alsaseq.
> tar xvzf chronos-theremin.tar.gz > cd chronos-theremin (at this point you need to edit path to alsaseq and maybe serial port in file chronos-theremin) > chmod +x chronos-theremin > ./chronos-theremin