This program is intended to act as a guard dog to notify you of attempted probes to your computer via the Internet. NetArmor's main objective is to detect possible malicious hacker backdoor intrusions and alert you so you can safely shutdown your machine, log off, or disconnect from the Internet. NetArmor is not a firewall, but a connecting monitoring utility - ideal for your personal and corporate protection. NetArmor can be set to alert you of all connections to your machine - or just possible malicious attacks. This sites been around a long time, and they do a great job.
Software is rated, and easy to find, but some days the site seems a little slow.
Literally hundreds of programs are available. You get mainframe quality tech support, and the best tools all from one source. Well organized, and fast. However, you may have to wade through a ton of end user software before you get to applications that you may actually find useful. NT Shareware One of our favorite sites.