Many online casinos lease or purchase their software from companies like CryptoLogic Inc, International Game Technology, Microgaming, Playtech and Realtime Gaming.
PokerTracker 3 supports online poker from the following poker networks and/or sites: 888 Poker Network, Bodog, Boss Media, Cake Network, Cereus Poker Network, Entraction Poker, Everest Poker, Full Tilt Poker, IPoker, Microgaming, Merge Gaming Network, OnGame, PartyPoker, PokerStars and Winamax.