PioSOLVER is a very fast GTO solver for Holdem. It handles postflop spots with arbitrary starting ranges, stack sizes, bet sizes as well as desired accuracy. It's the first in a new generation of tools moving poker from a game based mainly on intuition to a game based on analysis and math.
PioSOLVER answers questions which were impossible to answer before: What should betting frequency on the flop be? What hands are the best semi-bluffs on the turn? What hands are the best bluff catchers on the river? Which c-bet size is the best to use on the flop?