For Linux, IPTables is your firewall of choice.  It is the re-designed and heavily improved successor of the previous Linux 2.2.x ipchains and Linux 2.0.x ipfwadm systems.  You can download the package from http://www.netfilter.org/.

Does your computer contain a "Trojan" program or another virus?
Visit TrendMicro.com web site to have your computer scanned online for any potential threats, plus other security checks. This service is Free, and we highly rate it!

Do you need an Anti-Virus product? The answer is yes! AVG is a great company that offers a Free version to Home users. The software is easy to use, and will keep you safe from the things that go "bump" on the Internet.

Running Linux and still worried about viruses?  Check out Clam Antivirus.  Clam AntiVirus is a GPL anti-virus toolkit for UNIX. The package provides a flexible and scalable multi-threaded daemon, a command line scanner, and a tool for automatic updating via Internet. The programs are based on a shared library distributed with the Clam AntiVirus package, which you can use with your own software. Mostimportantly, the virus database is kept up to date .

Getting lots of pop-up or has your browser been hijacked?
We recommend downloading two software packages that will help keep your computer safe. One, download Ad-Aware from the Lavasoftusa web site. Once you have checked your computer with Ad Aware, check it next with SpyBot. Both products are available for FREE for residential clients, but if they are useful to you -- please consider supporting these fine products.

While spyware and adware are not issues with Linux-based systems yet, it is still highly suggested that you scan for rootkits.  A rootkit is a collection of software binaries or patches that modify an existing piece of code, usually an operating system, allowing a user to operate with administrator privileges.  Download chrootkit and be sure you are safe.  Chkrootkit is listed in the "Top 100 Network Security Tools" survey, 2006 edition, released by Insecure.Org.

Do you use Windows 98/2000/XP/Vista?
If yes, when was the last time you visited Microsoft's web site to update your computer with the latest system files? Believe us, you should always try to install all "Critical Updates" to your computer. Check for new updates here. NOTE – Official support for Windows 95/98/ME/2000 from Microsoft has ended.

NetStat Live is a TCP/IP protocol monitor which can be used to see your exact throughput on both incoming and outgoing data whether you're using a modem, cable modem, DSL, or even local network. As a bonus, NetStat Live will also graph the use of your CPU to help you see if your computer is slowing you down, or if it is just the Internet.

Looking for a new file? Game, utility, or anything in-between. Try going to Download.com. If your not sure what to download, choose "Most Popular". This will show you what everyone else is downloading.

Have you seen or heard people asking what does Port (Insert a number) do? NetworkSorcery has a great listing of all known Ports that have been assigned by IANA. This is a great online resource.

Ever wonder where all the emails you are receiving are coming from? They seem to have a two-letter extension that you have no idea what it means. You can now look up the extension from our Internet Country Code chart.

Have you ever wondered what Hardware & Software is installed in your computer? Download Belarc and it will give you a snapshot of your computer. Excellent program.