Deluge is a great freeware BitTorrent client. It is open source and has plugin capabilities.

Its interface is simple but effective and is light on system resources. It has versions for Windows, Max OS X and Linux.

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• Deluge 0.5.9.0
• Deluge 1.0.2
• Deluge 1.0.0
• Deluge 0.9.0.9
• Deluge 0.9.0.3