Touché is a free, open-source tracking environment for optical multitouch tables (FTIR, DI, Lasers). It has been written for MacOS X Leopard and uses many of its core technologies, such as QuickTime, Core Animation, Core Image and the Accelerate framework, but also high-quality open-source libraries such as libdc1394 and OpenCV, in order to achieve good tracking performance.

The Touché environment consists of two parts: A standalone tracking application written in Cocoa, that comes with lots of configuration options as well as calibration and test tools, and a Cocoa framework that can be embedded into custom applications in order to receive tracking data from the tracking application. This way, you can easily experiment with MacOS X technologies such as Core Animation or Quartz Composer on your multitouch table.

Key features include a powerful filter pipeline, an easy-to-use embeddable framework to communicate with the tracker, and output of tracking data via the TUIO protocol, as well as direct output of tracking data to Flash applications.

Touchsmart TUIO is a bridge application for Windows XP/Vista, which can output touch data from Nextwindow API-compatible touch screens in the same formats like Touché. Nextwindow screens are used, among others, on HP Touchsmart PCs.