Comodo Firewall

Features
Download World’s #1 Free Firewall that finds threats and protects your PC
Fast and hassle-free online experience
Manages traffic on your PC
Blocks all Internet attacks
Secures all connections when you are online
Monitors in/out connections
Comodo Firewall Pro introduces the next evolution in computer security: Default Deny Protection (DDP™). What is DDP? Most security programs maintain a list of known malware, and use that list to decide which applications and files shouldn’t access a PC. The problem here is obvious. What if the list of malware is missing some entries, or isn’t up to date?
DDP fixes this problem to ensure complete security. The firewall references a list of over two million known PC-friendly applications. If a file that is not on this safe-list knocks on your PC’s door, the Firewall immediately alerts you to the possibility of attacking malware. All this occurs before the malware infects your computer. It’s prevention-based security, the only way to keep PCs totally safe.
No complex configuration Issues — perfect for amateur users
Quickly learns user behavior to deliver personalized protection
User-friendly, attractive graphical interface
Lots of configuration options let techies configure things just as they like
DDP-based security keeps you informed and PCs safe