Portmaster is a free and open-source application firewall that does the heavy lifting for you. Restore privacy and take back control over all your computer's network activity.
With great defaults your privacy improves without any effort. And if you want to configure and control everything down to the last detail - Portmaster has you covered too. Developed in the EU , Austria.
Disclaimer: I do not own this application or tool. I'm just here to share it, but you're free to support the developer. The tool/application's working capability and other issues depend on keeping the project alive by the author. Use it at your own risk.