Ballistic: FTE for the iPhone has been the greatest piece of ballistic software that I've ever used. The software producer is always improving and updating the software, which is a free update, and the program only cost me $15 in the first place
This program has allowed me to make my longest cold bore hit on an animal so far- 942 yards on a coyote. I just punch in the variables, the program spits out the corrections and I dial it into the turrets. Easy enough. The hard part is dealing with the friggin' wind and mirage at extreme range, not calculating the elevation correction.