PeerGuardian 2 is a premier IP blocker developed by Phoenix Labs' exclusively for Windows. Its integrates support for many lists, list editing, automatic updates, and blocking all of the IPv4 including TCP, UDP and ICMP.
Its main goal is to protect your privacy on P2P on safest and easiest way.
Not like other commercially available softwares, this PeerGuardian 2 is Open Source, that’s mean the program code is available online freely for anyone who needs it. Because of this license type it will allows you to make modifications or even branch off into your own project, but it always recommends and encourages to do a peer review of the code to make sure that any bugs are eliminated promptly. Don’t worry you can assured there are no backdoors or spyware hidden.
Point to note that the development of this product has been discontinued by the original authors, but this has been continued by a new team under a new name called PeerBlock.
Windows 9x / 2000 / XP / XP 64-bit / Windows 10 / Windows 10 64-bit