Subterfuge is a framework to take the now familiar art of Man-in-the-Middle attack and make it as simple as point and shoot. It has a beautiful, easy to use interface that produces a more transparent and effective attack. This is what sets Subterfuge apart from other attack tools. It demonstrates vulnerabilities in the ARP Protocol by harvesting credentials that go across the network, and even exploiting machines through race conditions. Subterfuge is a small but, effective credential-harvesting program which exploits a vulnerability in the inherently trusting Address Resolution Protocol.

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http://code.google.com/p/subterfuge/downloads/list