Download of PokerZebra 1.2 for Mac was available from the developer's website when we last checked. We cannot confirm if there is a free download of this app available. The actual developer of this software for Mac is Barbary Software. Please check the Mac app with an antivirus before launch as it is downloaded from the developer's website, and we cannot ensure that it is safe. The software lies within Games, more precisely Board.
From the developer:
PokerZebra shows you the odds that a Texas Hold'em hand will win against other hands. Use it to calculate your equity in a Texas Hold'em pot.
You'll have to enter any board cards that are currently known, enter your hand, and enter your opponents' hands. Click on "Calculate", and PokerZebra does an exhaustive calculation of all possible outcomes.
You may want to check out more Mac applications, such as Treasure Chess, Monster Ball Demo or MyNevermind, which might be related to PokerZebra.