Comodo Firewall 

The Windows’ default firewall is a pretty decent security solution for your system, but it’s far from being perfect. That’s why more powerful stand-alone firewalls like this one have been developed. Comodo Firewall is a very complex and feature-rich security program provided completely for free.

Comodo Firewall is a comprehensive multilayer firewall application that uses cloud-based data and comes with a lot of additional options in order to provide a truly reliable security solution. Therefore, it is able to detect and block any threat before it causes any real damage. It analyzes any new program or connection and it identifies its safety level, accurately deciding if it should be allowed to run or if it represents a danger. For even higher levels of protection, the unknown and untrusted files can be run in a “sandbox” - a virtual environment that doesn’t modify any data on the “real” system.

The accurate connection monitoring and the powerful packet filtering make sure that your system is protected against any outside attack caused by hackers or malware. Even though it is very complex and powerful, Comodo Firewall is also very easy-to-use. Its interface is pretty simple, straightforward and self-explanatory; therefore anyone will be able to use this tool without problems, including beginners.

Briefly, Comodo Firewall is one of the best firewalls one can find, as it is both powerful and easy-to-use while it also has no downsides. It simply gets the job done and it also costs you absolutely nothing.