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The Augmented Reality Tool Kit (ARToolKit) captures images from video sources, optically tracks markers in the images, and composites them with computer-generated content using OpenGL. Dual-licensed, under the GPL, plus commercially by ARToolworks, Inc.
You can download file releases of ARToolKit project from List of release files
System RequirementsOperating System: All 32-bit MS Windows (95/98/NT/2000/XP), MacOSX, POSIX (Linux,BSD,Solaris etc..), IRIX, Linux
List of release files