Gravity3D shows the motion of bodies moving under the influence of gravity in three dimensions. It u
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Terra
Terra gives you quick access to astronomical information, weather forecasts, earthquake reports, tim
看更多 »Perfect Pitch
Perfect Pitch is for singers and other musicians needing accurate pitches in equal temperament.The s
看更多 »ShapeForge
A 3D sketchbook/constructor that lets you define a shape, color it or put an image on it, examine it
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