Tor

Open source; Donationware

Current Version: 0.2.1.26 (June 1, 2010)

From the Tor home page: "Tor is a software project that helps you defend against traffic analysis, a form of network surveillance that threatens personal freedom and privacy, confidential business activities and relationships, and state security. Tor protects you by bouncing your communications around a distributed network of relays run by volunteers all around the world: it prevents somebody watching your Internet connection from learning what sites you visit, and it prevents the sites you visit from learning your physical location. Tor works with many of your existing applications, including web browsers, instant messaging clients, remote login, and other applications based on the Internet's TCP protocol."

Tor is based on Privoxy, a web proxy with advanced filtering capabilities for protecting privacy, modifying web page data, managing cookies, controlling access, and removing ads, banners, pop-ups and other obnoxious Internet junk. Privoxy has a very flexible configuration and can be customized to suit individual needs and tastes. Privoxy has application for both stand-alone systems and multi-user networks.

Tor requires more than just the software; it involves some behavioral changes as well, which are documented nicely on the Tor website.

Tor 0.2.1.26 fixes the following bugs:

• Fix a regression from our patch for bug 1244 that caused relays to guess their IP address incorrectly if they didn't set Address in their torrc and/or their address fails to resolve.
• When freeing a session key, zero it out completely. We only zeroed the first ptrsize bytes.
• Fix a dereference-then-NULL-check sequence when publishing descriptors.
• Fix another dereference-then-NULL-check sequence.
• Make sure we treat potentially not NUL-terminated strings correctly.