throttled is a bandwidth shaping application for Mac OS X and FreeBSD which allows you to cap your upstream bandwidth, prioritize ACK packets, and keep your download speeds high even when your server is sending out at full speed.

Features:

• Allows you to set a global bandwidth cap for all your applications, or multiple caps with different speeds to guarantee all your servers a certain amount of bandwidth.
• Allows you to setup wighted queues for your network data to guarantee low-latency ssh, telnet, etc connections on your server.
• Includes optimizations for many online games including Unreal Tournament 2004, World of Warcraft, Call of Duty, Ghost Recon, Starcraft, Warcraft II, Warcraft III, and Diablo II.
• Prioritizes TCP ACK packets to allow consistent bandwidth in both directions even under heavy server load.
• It uses almost no resources. CPU usage is around 0 - 3% and it uses less than 500k of RAM.
• Source code is freely available, and released under the GPL. Please read the COPYING file in the distribution.

Requirements:
OS X 10.4-10.7
Universal Binary