You could try playing online the flash version of the games or by trying the big online casinos intown , they might have mac versions of the game, there are various alternative versions of the games, the problem is that a regular mac user is not necesarly on the range of online casinos marketing rigs, and remember when starting the game there's a path to follow is to :
1. learn the game
2. know that this a -EV change game
3. Systems work but are highly risk and their results change from casino to casino
4. To offset the risk of the roulette game just use betting systems, here are a couple of examples, please feel free to search over the internet also and if something like this come up, feel free to share. info-roulette.info/index.asp?ID=3
hope it helps...