How much is your hand worth? Determining the odds in a game like no-limit Texas Hold'em can require some complicated calculations. There many poker programs that can calculate poker odds. Most of these poker simulators use a general purpose algorithms to perform the poker odds calculations. This generic approach doesn't take advantage of the full range of possible optimizations. To explore the effect of global optimizations, a preflop evaluator which can fully enumerate complex preflop situations was developed. This "zealous" evaluator is able to compute an exact solution roughly 100 times faster than any general purpose evaluator. PokerStove is the result of this work. PokerStove is a poker calculator for Texas Hold'em. It is currently available free of charge, with no spyware, spam or other annoyances. Download and enjoy.