Transmission

Transmission is a lightweight bittorrent client that is open source. It runs natively on five different operating systems (BSDs, linux, and MacOSX) and does Peer Exchange in the background to optimize the downloading of files. The ease of navigation and the fact that it’s open source makes it an attractive “no bloat” p2p package. Take a look if you’ve been looking for something that doesn’t suck up your resources whenever you launch the client and chews up that precious bandwidth that you could be using on World of Warcraft.
CoolOSXApps < Transmission