Comodo Firewall 8.1

Been using it for a few days, seems to provide quite a good protection but I tried the Sandbox part and it made my PC freeze. Also, it gives a notification for just about any program running that it doesn't know, so the user should be ready to be asked to allow or deny programs from running many times (and should know what they are). It might be a little aggressive experience at first but probably worth it.

It is free, facilities involved, had wonderful Persian. It is the most important point of the entire program.