Have you heard of Stitch Fiddle? It's a free new stitch charting tool from the Netherlands that serves knitters, embroiderers/cross stitchers, and crocheters! You can use it to make traditional stitch charts, filet charts, and color charts. It seems really versatile. I played around with it a bit recently and have decided that, for me, it is probably most useful for its ability to make color charts. You can even set the gauge for your chart, as well as the dimensions. Here are a few screenshots of my experimentation. Be sure to try it out for yourself, and thanks to Toni for introducing me to it!