Comodo firewall Pro

Continuing with some security related software, the turn has come to firewall software. As with antivirus programs, there are a number of commercial alternatives and several free alternatives. I used ZoneAlarm for a while, but about a year ago I started using Comodo Firewall Pro.
I feel that Comodo is a much less resource intensive program than ZoneAlarm. Furthermore, it seems to be better to detect programs using other programs to access the Internet.

http://www.personalfirewall.comodo.com/download_firewall.html