The best is bitdice.me, I have some money there that has close to doubled. Or the most risky and most porfitable is still just-dice, I'm almost up x5 in bitcoin value from the 100 clams I bought, but if JD shuts down the value of clam will be 0. Another option is MoneyPot which allows you to invest in BetterBets an other sites, but the returns are likely not really worth the risk (I'm only now finally up 5%, after 2 months of loss). For sites like: Win88, PocketRocketCasino, DaDice, PeerBet don't listen to the owners and do your own research but I'm sure they're all either scams in the making or when they shut down they'll take everyones money with them. DiceNow I think is also legitimate but has no volume so pointless to invest in