OpenSnitch is a GNU/Linux port of the Little Snitch application firewall.

pfsense fork - Your next Open Source Firewall !
Secure Your Network with ease.
From Virtual Private Networking to Intrusion Detection, Best in class, FREE Open Source Project.

• How to Configure an OPNsense Dashboard @ bsmithio.

This is a mini-firewall that completely isolates a target device from the local network. This is for allowing infected machines Internet access, but without endangering the local network.

A tool for analyzing firewall rules

pfSense is a free, open source customized distribution of FreeBSD tailored for use as a firewall and router. In addition to being a powerful, flexible firewalling and routing platform, it includes a long list of related features and a package system allowing further expandability without adding bloat and potential security vulnerabilities to the base distribution. pfSense is a popular project with more than 1 million downloads since its inception, and proven in countless installations ranging from small home networks protecting a PC and an Xbox to large corporations, universities and other organizations protecting thousands of network devices.

Go beyond firewall and UTM basics to total control of web content, applications, bandwidth usage and remote access in a single solution.