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Useful chart of TRL ring sizes with wire, inner diameter, aspect ratios, and best of all, to-scale circles showing the exact sizes of the rings.

This webapp enables one to inject randomosity into one's multicoloured projects; rather than doing, say, one row of Colour A, one row of Colour B, one row of Colour C, this helps one mix them up a bit. You choose from a palette of colours (not a lot, but a fair amount), put in the row-thickness one accepts, and it will generate a random pattern (e.g 4 rows of A, 2 rows of C, 1 row of B, 6 rows of C etc). If you don't like the pattern, refresh the result and it will give you a new one.

Pretty nifty.