Now i am working on Untangle Server..actually it;s gateway which provide u all types of security like spamming, virus blocking, phishing, malware blocker as well as it's come with firewall, openVPN feature.
Now untangle server is free open source firewall..you can download from www.untangle.com.
There are some applications are paid and other applications are free.
Untangle provides a powerful suite of Internet management applications for small-to-medium businesses and education institutions.
The Untangle Server is a multi-function firewall. It simplifies and consolidates the many network and security products that businesses need at the gateway to the Internet. Untangle comes as standard with these free, open-source applications:
# Web Filter – Prevents access to undesirable web sites
# Virus Blocker – Prevents viruses from reaching computers on the network
# Spam Blocker – Stops junk email from getting through
# Ad Blocker – Blocks online adverts that waste network capacity
# Attack Blocker – Stops denial of service (DOS) attacks
# Phish Blocker - Protects people from identity theft "phishing"
# Spyware Blocker - Protects people from websites that install malware
# Firewall - Hides your network from the Internet
# QoS – Allows internet traffic prioritization
# Intrusion Prevention – Protects the network from hackers
# Protocol Control - Blocks protocols for online games, IM & P2P
# OpenVPN – Allows secure remote access to the internal network
# Reports - Shows who is doing what online
Automatic updates - No need to install updates