Guarding your privacy when using Peer-to-Peer networks is important as it can ensure you’re away from organizations and individuals which collect data about us without consent. PeerGuardian 2 is an IP address blocker software that can prevent access to thousands of sites. It uses multiple, categorized lists and you can choose which type of site(s) you want to block, including spyware/malware related, advertising related, P2P file sharing related and more. The lists are maintained and updated by a community and you can automatically have the program download the latest lists, and also create your own based on your personal blocking preference.
PeerGuardian 2 is still not a stable version for Windows Vista and may encounter driver error, problems etc. Make sure, the firewall is not blocking. Also many online gaming users should be aware that PeerGuardian will break game connectivity by restricting access to some servers. I haven’t seen any PeerGuardian 3 in build.
PeerGuardian alternative for MAC, OS X : PG2 MAC;
Download PG2 Mac
PeerGuardian alternative for Windows : ProtoWall
PeerGuardian alternative for Windows Vista x64 : Use of ipfilter.dat
Read More info here.