PokerStove is a freeware probabilistic poker calculator that determines the odds of winning a Texas Hold'em hand using combinatorics.

[1][2] PokerStove is a program that calculates hand equities (i.e., expected percentage of the time that each hand wins at showdown).

[3] Since poker is a game of incomplete information, the calculator is designed to evaluate the equity of ranges of hands that players can hold, instead of individual hands.

[4] Pokerstove can calculate both pre-flop and post-flop equity given the community cards.

Poker instructor, Gavin Griffin, recommends PokerStove as a calculator for EV in poker[5] and considers it the best tool for calculating EV based on hand ranges.