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reacTIVision is an open source, cross-platform computer vision framework for the fast and robust tracking of fiducial markers attached onto physical objects, as well as for multi-touch finger tracking. It was mainly designed as a toolkit for the rapid development of table-based tangible user interfaces (TUI) and multi-touch interactive surfaces. This framework has been developed by Martin Kaltenbrunner and Ross Bencina as part of the the reacTable project, a novel electronic music instrument with a table-top multi-touch tangible user interface.

The latest stable version reacTIVision 1.4 also implements basic multi-touch finger tracking, identifying simple white blobs as finger tips on the surface. This generally works with DI (diffuse illumination) as well as with FTIR solutions (only touch). Additionally the overall robustness and speed of the fiducial tracking has been improved.

Along with reacTIVision itself, the framework also offers many additional tools, such as the TUIOSimulator and several TUIO client implementations, which have been originally developed as part of the reacTIVision project. You can download this software and the related toolkit from its release site.