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StarStaX is a fast multi-platform image stacking and blending application, which is developed primarily for Star Trail Photography. Besides star trails, it can be of great use in other settings. StarStaX allows to merge a series of photos into a single image, where the relative motion of the stars creates structures looking like star trails.
StarStaX is currently under development. The current (development) version 0.41 was released on May 30, 2011. StarStaX is available as a free download for Mac OS X and Windows.