Moon Secure AntiVirus is a free antivirus software download which claims to the best free and open-source antivirus solution for PC. This reliable antivirus software is intended for its use under the Windows OS’s and allows you to keep your system safe from all kinds of malicious files, such as viruses, spyware, keyloggers and all sorts of malware that you may come across on the Web even inadvertently.

Pros:

• Free and open source.
• Light on resources,
• Fairly good detection rate, based on Clam AV database.
• Simple installation, real time scanner.

Cons:

• Not matured product.
• Sometime real time scanner doesn’t work without notice.
• No spyware, firewall or heuristic engine.

It is fairly good anti virus product to hang with though it has lots of potentials.