Tor is a free and open source privacy toolset for a wide range of organizations and people who want to improve their safety and security on the Internet. Using Tor can help you anonymize web browsing and publishing, instant messaging, IRC, SSH, and more. Tor also provides a platform on which software developers can build new applications with built-in anonymity, safety, and privacy features.

Note: Tor needs to be compiled before use.

Requirements:
OS X