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Tigger is a FITS viewer and sky model management tool developed as part of MeqTrees, but also available separately. Tigger is written entirely in Python, and features a modern Qt-based GUI for displaying FITS images and overlaying "sky models" (i.e. catalogs). Tigger was initially conceived as a sky model manager, but it was quickly realized that it would be awfully nice if these models could be plotted on top of sky images, so a FITS viewer was introduced and functionality quickly snowballed.