PeerGuardian

PeerGuardian 2 is Phoenix Labs' premier IP blocker for Windows. PeerGuardian 2 integrates support for multiple lists, list editing, automatic updates, and blocking all of IPv4 (TCP, UDP, ICMP, etc), making it the safest and easiest way to protect your privacy on P2P.
PeerGuardian 2 is Open Source, meaning the program code is available online for anyone who wants it. Not only does this allow you to make modifications or even branch off into your own project, but it encourages peer review of the code making sure any bugs are eliminated swiftly. Because PeerGuardian 2 is Open Source, you can rest assured there are no backdoors or spyware included.

Development of this title has been discontinued by the original authors, but has been continued by a new team under the name of PeerBlock.

- This fixes a couple bugs, updates some urls, and adds a new feature:
- Update servers will be auto-allowed while updating, and then go back to regular settings (ie if they are blocked) when it's done. this can be turned off via the config file AllowUpdates setting, but is not recommended!
- Also has a performance enhancement in the driver :)