Unless there is freeroll the top of my list is Tigergaming. I have played on Tigergaming at different tables on successive nights and noticed the hands from the previous night's table coming up on th eother night. I noticed this because on the first night I had AA and the flop was AQQ, the turn 8s the river A. The next night, I had QQ, the exact same flop; the other player had the quad ACEs. I started tracking hands and was able to predict the outcome of several. These repeating hands occurred on play money tables, so I played in some real satellites until my first repeat hand.
I like Canbet but the software is extremely poor.
Casino Tropez - they offer a $10 free sign up bonus, have aggressive sales staff, and no poker.