Below is a list of the top 5 free firewall software that you can download and install for your PC protection.

1. COMODO Firewall Pro FREE (DOWNLOAD)
   

Comodo is delivering this highly rated firewall free as a cornerstone of an initiative to empower consumers to create a safe and trusted online experience. In addition to the excellent inbound/outbound firewall engine, Comodo includes also a host intrusion prevention module, malware scan engine for checking for viruses, trojans and spyware and many other features that you don’t usually find in free products. It is our top recommendation.

2. Sunbelt Personal Firewall (DOWNLOAD)
   

After Sunbelt has acquired Kerio, the well known Kerio firewall product is now called Sunbelt Personal Firewall. Its a pretty good choice when you want just a firewall engine that checks both inbound and outbound connections with low performance impact on your computer.

3. Zone Alarm (DOWNLOAD)
   

Checkpoint, one of the leaders in Enterprise Firewalls, got into the end-user market by acquiring Zone Alarm. The Free Basic Firewall version of Zone Alarm is a good choice but with somewhat limited capabilities compared with their commercial firewall versions. It provides inbound/outbound protection and stealth mode operation.

4. Agnitum Outpost Firewall Free (DOWNLOAD)

The free Outpost firewall makes your computer invisible on the Internet, locks your computer’s internet ports against intrusion, let’s you decide what applications should be trusted, prevents your computers from being controlled remotely and many more.

5. Ashampoo Free Firewall (DOWNLOAD)

Ashampoo monitors both incoming and outgoing computer’s network activity for providing a heavy-duty firewall protection. With two modes of operation (Easy mode and Expert Mode) is suitable for both novice and expert users. In “Learning Operation” it automatically identifies programs that try to make connections and lets the user decide whether to allow them or not.