
I can’t believe I have only just discovered this cool site! There is a colorwork chartmaker, as well as many, many shared colorwork charts that others have designed. You do need to register but there is so much great content above and beyond the chartmaker – techniques, lace knitting, free patterns, etc.
http://www.tricksyknitter.com/
http://www.tricksyknitter.com/knitting-chart-maker/create-a-color-chart/