Bit Torrent...where do I find it???

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G'day all,
Well I've been using a cracked version of Bearshare Pro for a little while now as the downloads are quick as but of late it's just been ****ing me off, I've also got Ares and got some pretty dodgey downloads of late. After a thread was put up about P2P's I noticed a lot of people seem really happy with Bit Torrent so decided to take a look but every where I went, a credit card was needed or the mirrors linked were to places I have no idea about, is there a free version or will I have to invest in a card?
Thanks again ppl's