From the site:
Touché is a free, open-source tracking environment for FTIR-based multitouch tables.
FTIR stands for "frustrated total internal reflection".
The inventor/pioneer of FTIR, Jeff Han
Multi-Touch Interaction Research
Here's a guy who has built an FTIR table
Bridger's Multi-touch: Creating a New FTIR Frame
But here's someone who shows how to build it, and sells finished tables:
FTIR Multitouch and Display Device - Experiments with Processing, OSC - Thomas M. Brand
| August 2008 | ||||||
| Sun | Mon | Tue | Wed | Thu | Fri | Sat |
| 1 | 2 | |||||
| 3 | 4 | 5 | 6 | 7 | 8 | 9 |
| 10 | 11 | 12 | 13 | 14 | 15 | 16 |
| 17 | 18 | 19 | 20 | 21 | 22 | 23 |
| 24 | 25 | 26 | 27 | 28 | 29 | 30 |
| 31 | ||||||