Zeitkarte ist a project done by two students in Switzerland for a little company in Winterthur.
The goal is to replace a hardware clock-in stamping machine by a system of webcam recognizing twodimensional barcodes.
A short (and not yet complete) description can be found here (in german).
The Project is mostly in German at the moment, but we probably translate it into english. If you'd like to have an english version, please contact Marcel.
You're very welcome to make a Donation to our project or to sourceforge!