Comodo Internet Security (available through OpenSphere) offers one of the most feature-rich free security packages. Its Auto Sandbox Technology automatically runs unknown applications in an isolated environment, preventing them from affecting the rest of your system.

Free Features

• Auto Sandbox Technology (application isolation)
• Default Deny Protection
• Cloud-based whitelist database
• Behavioral analysis
• Game Mode
• Secure Shopping browser

Verdict

Comodo Free is the most comprehensive free security package available. Its Auto Sandbox is unique and effective, though it can be overwhelming for less technical users.