StitchRV is a fiducial and touch-tracking engine based on the popular reacTIVision fiducial tracking system. StitchRV combines video input from multiple cameras in real time, and can be customized for a wide range of hardware and fiducial tracking applications through the high-performace rapid prototyping environment openFrameworks. The multicamera approach facilitated by StitchRV also allows greater diversity and flexibility than single-camera systems when designing computer vision based tangible and multitouch prototypes. Author Keywords Multiple camera fiducial tracking, visual marker tracking, fiducial markers, tangible interaction, reacTIVision, openFrameworks. ACM Classification Keywords H5.m. Information interfaces and presentation: Miscellaneous, I.4.9. Image Processing and Computer Vision Applications General Term Human Factors.