Current release: 0.5.2 (experimental). Requires Power Macintosh and System 7.0 or later.
TextureFnoob is a graphics tool which can do anything. Okay -- a good approximation of anything. It allows you to construct functions out of basic mathematical elements: numbers, addition, subtraction, colors, color-blending, color maps, rotations, translations, Perlin noise and turbulence functions, and dozens of other operations. And then it dynamically generates the result. The marble texture above is one simple example.
Computer graphics are made of mathematics. TextureFnoob does not give you a preprogrammed set of special effects; it gives you a set of mathematical functions and lets you construct whatever image you want. If you're still not grasping how powerful this is, see my gallery of examples.
Where did it come from, and what can you do with it?
A whole bunch of things I've done, which serves to demonstrate exactly how disturbingly flexible TextureFnoob is.
(Hint: here. And yes, it's freeware.)
Well, not very frequent. But this might tell you something you wanted to know.