The first options I've included are programs that run on your PC; the other two are designed to run on your network. Portmaster is a firewall for any PCBuilt on WFP but with way more controlClosePortmaster is a firewall suite from Safing. As a result of everything it can do, it is quite a bit heavier than Windows' firewall, or any other option on this list. While there is a paid Pro tier for access to Safing's SPN network, the core firewall and filtering remain free. Fort FirewallYou get better control over svchostCredit: Fort FirewallFort Firewall is a free, open-source tool built directly on the Windows Filtering Platform.