PeerGuardian is a premier IP blocker for Windows. With features like support for multiple lists, a list editor, automatic updates, and blocking all of IPv4 (TCP, UDP, ICMP, etc), it is the safest and easiest way to protect your privacy on P2P. Plus, by integrating with Blocklist.org lists are built custom just for you.

Licence Type: Freeware (Open Source)

Operating Systems Support: Microsoft Windows

Download Link: PeerGuardian 2.0 Beta 5b
Developers Homepage:PeerGuardian