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Untangle Open Source Applications, one of linux platform provides integrated security for gateway , router , firewall , IPS  solutions . One of the best platform for Network Security 2008 base on Linux.com

website : www.untangle.com 

Overview :

Untangle delivers an integrated family of applications that simplify and consolidate the network and security products that businesses need at the network gateway.
Pre-configured to work right away
Downloadable for rapid deployment
Integrated with a common GUI, logging & reporting
Designed to run on generic Intel/AMD hardware

Features of Untangle Open Source Applications:

1. Web Filter

Control Web Content at the Gateway 

Untangle Web Filtering enables administrators to enforce network usage policies and monitor user behavior. Zero client installation and category block lists make it easier for administrators to:
Protect the network from malware on the web
Block time-wasting sites like MySpace
Conserve bandwidth by blocking audio/video downloads

2. Spam Blocker

Block Spam at the Network Gateway

Spam Blocker enables administrators to block spam at the gateway before it ever reaches the users. Zero client installations and an intuitive GUI make it easy for administrators to:
Leverage the best spam filtering techniques including Bayesian Filters, Razor, realtime block lists (RBLs), OCR for image spam and tarpitting
Provide individual quarantines for each mailbox
Filter SMTP, POP & IMAP

3. Spyware Blocker
Block Spyware at the Network Gateway

Spyware Blocker enables administrators to block spyware at the network gateway before it reaches users desktops. Zero client installations and an intuitive GUI make it easy for administrators to:
Protect users from browsing websites that install malware
Scan network traffic to block spyware before users can install it
Ensure that signatures are always current with automatic updates

4. Protocol Control
Block Port Hopping Applications

Protocol Control lets administrators take back control of their networks from disruptive port-hopping applications like peer-to-peer applications or online games. Signature based layer 7 filtering makes it easy for administrators to:
Conserve bandwidth by blocking applications like peer-to-peer that open multiple TCP ports
Improve productivity by blocking IM & online games that evade firewall rules
Write custom signatures for any protocol
5.Virus Blocking

Like i said before about Anti Virus Program , which is ClamAV .

ClamAV is Open source & Free under the GNU General Public License (GPL)
Kaspersky is the best-of-breed anti-virus solution, starting at $10 per month
Unlike desktop solutions, Untangle sits at the network gateway and automatically updates signatures so you don’t have to worry about whether or not your users have disabled their client software in anyway
Protection on the most common email protocols SMTP, IMAP, and POP
Protection for webmail and file transfer via HTTP and FTP protocols
Reports and event logs show you what viruses are being blocked on the network

6.Phish Blocker IPS

Block Phishing & Pharming at the Gateway

Identity thieves are becoming increasingly sophisticated with email and website spoofs that are nearly impossible to discern from the real thing. Phish Blocker makes it easier for administrators to:
Protect users from email phishing attacks and fraudulent pharming websites
Protect multiple protocols, including HTTP, SMTP, POP & IMAP
Ensure that signatures are always current with automatic updates

7.Attack Blocker

Keeping DOS Attacks at Bay

Attack Blocker stops denial of service (DOS) attacks. Pre-configured settings and an intuitive GUI make it easier for administrators to:
Provide 24/7 network protection from DOS attacks
Sort good traffic from bad with reputation-based heuristics
Put legitimate users with intensive bandwidth needs on Passlists

8.Firewall

Your First Line of Defense

Firewalls draw the line which separates internal and external networks. Untangle’s Firewall filters traffic based on IP address, protocol and ports that allow administrators to:
Designate which systems and services (http, ftp, etc.) are publicly available
Create a DMZ and perform NAT (with Router)
Run as a transparent bridge to complement existing hardware

9. OpenVPN

Secure Remote Access
OpenVPN lets administrators provide secure remote access to the internal network. Untangle’s intuitive GUI makes it easier to:

Configure basic settings through a setup wizard
Generate custom certs for each client
Easily distribute client software via email

10.Untangle Reports

Network Visibility & Monitoring  

Untangle Reports provide administrators the visibility and data necessary to investigate security incidents and enforce acceptable network usage policies.
Monitor behavior at the user, client and incident level
Understand traffic flows and network usage patterns
Share reports in PDF or HTML formats

11.Routing & QoS

Networking’s Blocking & Tackling

Untangle is a flexible platform that can perform routing tasks or simply pass traffic as a transparent bridge. Untangle’s routing capabilities enable administrators to:
Provide the basics like NAT, DMZs, DHCP & DNS
Get fancy with multiple NAT spaces, routing tables and configurable MTU
Prioritize traffic with QoS
Support SIP & AIX VoIP traffic