I have a Macintosh, so I can't use BleachCalc
Instead, I created a web page that can do many of the things that BleachCalc does, here. I haven't double checked the calculations yet but it looks fairly solid. The PH adjustments will be off sometimes, I can't seem to figure out the right way to calculate the alkalinity correction.
I would love it if people could take a look and make suggestions or point out problems!