POV-Ray : Resources : Links : 3D Programs : Splines and Piping
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1.0 Beta by Mike Weber uses BSplines to make Pipes in POV-Ray plus make spline based animation paths

SpilinEditor is a graphical curve editor by Alessandro Falappa mainly designed for POV-Ray 3.0x raytracer. You can draw and edit 2D cubic_spline curves used in LATHE and PRISM primitives then obtain a 3D shaded preview (via OpenGL library) of the corresponding object. It takes advantage of an accelerated video card if present.

Steve Abbott's Celtic Knotwork for POV-Ray
Steve Abbott's Computer Drawn Celtic Knotwork. A program is available for download to draw Celtic knotwork that can output in POV-Ray format.

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