this is sweet! They've got web based, android, and iOS. Really cool.

http://www.awc.org/codes-standards/calculators-software

this calculator has a great rep around the www. I find it super useful, and love the way it graphically depicts the hot/cold spots in a given set of dimensions.

A while ago (a few months?) someone posted a link to an online calculator that would create contour plots on different microphone configurations.

You could input the type of pattern on the microphone, the angle, and the position. It would graph the power as a contour plot, as well as show the left to right balance and a number of other statistics.