Touche

Touche is a free, open-source tracking environment for optical multitouch tables.
Main features:
- Supports QuickTime-compatible cameras, FireWire cameras and Wii Remotes.

- Universal binary (though a somewhat recent G5 or Intel Mac is recommended).
- 64-bit support: Runs in native 64-bit mode on 64-bit Macs.
- Plenty of Core Image filters for good tracking results.
- Tracks bright blobs on dark background or dark blobs on bright background.
- Optionally tracks blobs based on a reference color.