Rakeback Networks
Merge Gaming Network
The Merge Network is the largest network that currently allows US players. It has seen a huge increase in volume since Black Friday. The software is rated as good although it can be difficult to play a large number of tables.
Carbon PokerEverleaf
The Everleaf Network is the fourth largest network that allows US players. The software uses the "Quantum Photon Shuffler" which is the most sophisticated random number generator for shuffling the cards in the industry. They offer two different versions of their software. One uses real looking players while the other uses custom avatars.