Portmaster

Portmaster is an application firewall that is available for Windows and Linux.  A limited free version is available.

https://safing.io/

https://www.howtogeek.com/this-is-my-favorite-network-security-app-on-linux/

https://www.howtogeek.com/these-open-source-firewalls-do-what-windows-defender-cant-and-theyre-free/

https://www.howtogeek.com/i-finally-found-a-windows-firewall-app-that-doesnt-get-in-my-way/