personal firewall

Online Armor Free is a personal firewall that protects you from hackers, malicious programs and identity theft. It features a self-learning rule engine that automatically configures firewall rules based on the programs you are currently using, as well as an option to edit or create rules manually. In addition to the firewall functionality, Online Armor Free also includes a Program Guard that can protect you from executing programs unknowingly and stops unrecognized programs from running on your computer. Other features include a firewall monitor that displays all current connections, tamper protection, keylogger detection, Script/Worm protection and more.

Freeware