You might expect that a free antivirus company would offer basic protection for free, but reserve advanced bonus features for the paid edition. However, in the real world, many of the most popular free antivirus tools pack full-scale protection along with a ton of extra features. Avast Free Antivirus gives you more than many competing commercial products. On top of excellent antivirus protection, it adds a network security scanner, a password manager, browser protection, and more. It's an amazing collection of security features, considering that this product is free.