Hi Sean,
you might try HSMAdviser (HSMAdviser.com), it has a great speeds and feeds calculator for all manner of materials and tools.
It also provides estimates of power/torque required, cutting force and tool deflection, all have proved useful as I flounder may way
thru. It has some useful little widgets for threading and some trigonometric calculators if coding manually or on the fly.
Free trial for a month or so but I liked it so much that I bought it....and getting me to part with cash is a mean feat!
Craig