Security is perhaps one of the most burning topics today.
The world of open source is laid with good intention.
There is so much you can do and more.
1.Zeroshell
Zeroshell is a Linux distribution for servers and embedded devices aimed at providing the main network services a LAN requires. It is available in the form of Live CD or Compact Flash image and you can configure and administer it using your web browser.
2.pfSense
pfSense is an open source firewall/router computer software distribution based on FreeBSD. It is installed on a computer to make a dedicated firewall/router for a network and is noted for its reliability and offering features often only found in expensive commercial firewalls.
3.IPCop
IPCop is a Linux distribution which aims to provide a simple-to-manage firewall appliance based on PC hardware. IPCop is a stateful firewall built on the Linux netfilter framework.
4.ClearOS
ClearOS Community is a cloud-connected Server, Network, and Gateway operating system designed for homes, hobbyists and Linux developers. ClearOS comes with a Marketplace full of easy to install apps and the solution is a snap to configure thanks to the intuitive web-based interface.
5.IPFire
IPFire is a free Linux distribution which acts as a router and firewall in the first instance. It can be maintained via a web interface. The distribution furthermore offers selected server-daemons and can easily be expanded to a SOHO-server.
6.Endian
Endian Firewall Community (EFW) is a "turn-key" linux security distribution that turns every system into a full featured security appliance with Unified Threat Management (UTM) functionality.
7.Sphirewall
Sphirewall allows you to manage your network by user and role rather than just individual devices. Users can move between devices, bring their own devices and share machines without any need for configuration changes. Perfect for BYOD "bring your own device" networks.
8.Smoothwall
The Smoothwall Open Source Project was set up in 2000 to develop and maintain Smoothwall Express - a Free firewall that includes its own security-hardened GNU/Linux operating system and an easy-to-use web interface.