Discussing anything illegal such as downloading movies is against the forum rules in case you didn't know. P2P and Torrents can be discussed as far as I know, just not anything illegal.
With that said, I've looked around when I first got a mac myself, but found nothing but limewire and frostwire. Frostwire is just limewire in a different client as far as I know. There was someone porting Ares to OS X, but nothing came of that.
In all honesty, I'd say forget about Ares entirely. It's just not safe, and depending on what you attempt to download, you could get one of the few OS X trojan viruses that exist.
Your next possible question is Torrents, which I do use from time to time. I use a program called 'Transmission' for those. There are other clients for OS X, but that one is what I like best.
