Augmented Reality (AR) techniques provide essential advantages as they superimpose virtual content with the real products. Using such hybrid prototypes, the user can sense several characteristics simultaneously and associate them with each other. We realize AR applications and tangible user interfaces using the visualization software COVISE. The AR functionality is provided by a plugin interface which can be adjusted and extended for own purpose. COVISE supports the optical infrared tracking systems DTrack by A.R.T., VICON MX and the marker based tracking system ARToolKit. Further, the electromagnetic tracking systems Flock of Birds and MotionStar are supported, as well as the mechanical tracking system FaroArm.