WFN (Windows Firewall Notifier) by Wokhan, Firewall extender/monitor

See
https://github.com/wokhansoft/WFN
https://www.wokhan.com/?sec=WFN#software_wfn

WFN started as an "extension" to the embedded Windows firewall, and offers real time connections monitoring, connections map, bandwidth usage monitoring... and has been made open source a few years ago. Features include:

Connections listing
Real time connections mapping with routes
Bandwidth monitoring
Adapters informations
Windows Firewall status management
Notification popup for unknown outgoing connections (optional)