This is a parametric OpenSCAD for generating round knitting looms, that can be used for making hats, socks, etc.

You can see pictures of these on google, e.g., http://www.google.com/search?hl=en&q=round+knitting+loom

Because it is parametric, you can use this to create an arbitrary density of pins: make any "gauge" or size of knitting device you like.

I created this mainly to learn how to use OpenSCAD and because I think knitting is theoretically interesting (although I don't have the patience to do it)