Open source System security

Firewall Builder

Firewall Builder is multi-platform firewall configuration and management tool. It consists of a GUI and set of policy compilers for various firewall platforms. (GPL)

Linux - FreeBSD

Gufw

Gufw is an easy to use Ubuntu / Linux firewall, powered by ufw. (GPL)

Linux

Lynis

Lynis is an open source security auditing tool. Its main goal is to audit and harden Unix and Linux based systems. It scans the system by performing many security control checks. (GPL)

Linux - FreeBSD - MAC OS X

NSnitch

NSnitch is a DNS server which records the IP address of requests made against it and then makes that IP available via a JSON API. It also provides lookups for Tor Node membership, DNS blacklist status and Geo data. (Apache)

Linux - Windows

Shorewall

The Shoreline Firewall, more commonly known as “Shorewall”, is high-level tool for configuring Netfilter. You describe your firewall/gateway requirements using entries in a set of configuration files. (GPL)

Linux

5 applications