pfsense - An Open Source Firewall

pfsense is a free, open source customized distribution of FreeBSD, as a software firewall it is powerful and flexible.the current version pfsense 2.0 includes most all the features in expensive commercial firewalls, and more in many cases.
The following is a list of pfsense 2.0 features. The main advantage of pfsense is we do not need to touch anything at the command line.

 -Firewall

- NAT (Network Address Translation)

- State Table

- Redundancy

- Load Balancing

- VPN (Virtual Private Network)

- Reporting and Monitoring RRD Graphs

- Real Time Info

- Dynamic DNS

And more....