LuckyFlop.eu and swcpoker.eu has good freerolls and if you are good player you can earn some money there.
Another place is betcoin.ag, but too crowd in betcoin freerolls, 10USD freerolls usually have 4-700 players, even winning a penny there is very difficult.
Not exactly 4-700 players as there could be only half from the number that are real person, I think due to the late registration time, those some player tried with 1 account, busted, login to the next account, rinse and repeat, keep doing the same thing so the number of registrant is high