ETC is a tiny distribution of linux combined with a PNG displaying web browser. Using an inexpensive surplus touchscreen PC, ETC becomes a interface for home control, MP3 players, or whatever you can imagine.

xorg/driver/xf86-input-elographics

Touchscreen calibration under Linux A snapshot of the state-of-affairs on 20 december 2009

touchcal a touchscreen calibration utility.
elotouch UNIX command line touchscreen driver for Elo touchscreens for use with Sun Ray thin clients.
xinput calibrator A generic touchscreen calibration program for X.Org