Firefox

Bittorrent if you don’t know, is swarm based downloading. For more information you can go here. I use it mostly to download Linux torrents, and game demos from sites such as 3dgamers.com. I have used Azureus for over a year in windows and in Linux. Being java based, once I installed Java 1.5 it ran flawlessly in osx. Woo! Some of its great features is that it can download multiple torrents at the same time, along with rate limiting your upload. This helps keep my latency down on the network, and speed up downloads.