I recently did some work with an ELO Touchsystems 1515L 15? LCD Desktop Touchmonitor. I was pleased with the touchmonitor's hardware and performance, but in order to make it work properly in Linux I had to find a suitable calibration program. Out of the box on several distributions this touchscreen exhibits Y-axis inversion, where touching the top of the screen moves the cursor to the bottom and vice versa. xinput-calibrator is a freedesktop.org project that worked well for calibration, fixing the Y-axis inversion issue, and as a bonus it works for any standard Xorg touchscreen driver.