Transmission has been built from the ground up to be a lightweight, yet powerful BitTorrent client. Its simple, intuitive interface is designed to integrate tightly with whatever computing environment you choose to use. Transmission strikes a balance between providing useful functionality without feature bloat. Furthermore, it is free for anyone to use or modify.

In separate benchmarks, Linux Format and Lacrocivious both found Transmission to use less CPU than any other GUI client. It even used less CPU than some non-GUI clients.

Transmission also has the lowest memory footprint of any major BitTorrent client.

Features:
• Uses fewer resources than other clients
• Native Mac, GTK+ and Qt GUI clients
• Daemon ideal for servers, embedded systems, and headless use
• All these can be remote controlled by Web and Terminal clients
• Local Peer Discovery
• Full encryption, DHT, µTP, PEX and Magnet Link support

Versions:
• Download is for current version
• Version 2.94 for OS X 10.7-10.9
• Intel version 2.84 for OS X 10.6
• Intel version 2.42 for OS X 10.5
• PPC version 2.22 for OS X 10.5
• Version 1.54 for OS X 10.4.11 with Security Update 2208-002
• Version 0.6.1 for OS X 10.3

Requirements:
OS X 10.10+
64-bit Intel