It is possible that the download link provided above does not refer to the intended version.
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It has an AutoGrid feature that lets you create complex knots from a simple graphical template. The knot at the top of this page was done with this technique. You create the knots in 2D then make them into 3D knots which you can rotate in 3D space. It can also output the knots in various 3D formats including VRML for viewing in browsers.
