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  Stellarium Portable 27 Apr 18

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  Shadows 7 Jan 15

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  Cheops 29 Oct 15

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  The GD&T Trainer Professional Edition 27 Oct 15

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  Math Mechanixs 27 Apr 18

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  Optical Lenses 26 May 15

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  Starry Night Backyard ESD 5 Dec 15

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  3D World Map 29 Apr 18