Firewalls

PeerBlock is a free and open-source personal firewall that blocks packets coming from, or going to, a maintained list of black listed hosts. PeerBlock is the Windows successor to the software PeerGuardian (which is currently maintained only for Linux). It blocks incoming and outgoing connections to IP addresses that are included on blacklists (made available on the Internet), and to addresses specified by the user. PeerBlock mainly uses blacklists provided by iblocklist.com.

PeerGuardian is a free and open source program developed by Phoenix Labs (software). It is capable of blocking incoming and outgoing connections based on IP blacklists. The aim of its use was to block peers on the same torrent download from any visibility of your own peer connection using IP lists. The system is also capable of blocking custom ranges, depending upon user preferences.

The Windows version of this program has been discontinued in favor of other applications (Phoenix Labs encourage current PeerGuardian users to migrate to PeerBlock which is based on PeerGuardian 2).

Simple tool to configure Windows Filtering Platform (WFP) which can configure network activity on your computer.

The lightweight application is less than a megabyte, and it is compatible with Windows 7 SP1 and higher operating systems.

The Pi-hole ® is a DNS sinkhole that protects your devices from unwanted content, without installing any client-side software. Easy-to-install: our versatile installer walks you through the process and takes less than ten minutes Resolute: content is blocked in non-browser locations, such as ad-laden mobile apps and smart TVs

OPNsense is an open source, easy-to-use and easy-to-build FreeBSD based firewall and routing platform. OPNsense includes most of the features available in expensive commercial firewalls, and more in many cases. It brings the rich feature set of commercial offerings with the benefits of open and verifiable sources.

The pfSense project is a free network firewall distribution, based on the FreeBSD operating system with a custom kernel and including third party free software packages for additional functionality. pfSense software, with the help of the package system, is able to provide the same functionality or more of common commercial firewalls, without any of the artificial limitations. It has successfully replaced every big name commercial firewall you can imagine in numerous installations around the world, including Check Point, Cisco PIX, Cisco ASA, Juniper, Sonicwall, Netgear, Watchguard, Astaro, and more.

“Snort is the foremost Open Source Intrusion Prevention System (IPS) in the world. Snort IPS uses a series of rules that help define malicious network activity and uses those rules to find packets that match against them and generates alerts for users.”

“Ufw stands for Uncomplicated Firewall, and is program for managing a netfilter firewall. It provides a command line interface and aims to be uncomplicated and easy to use.”