GlassWire - Visualize network activity in detail, get notified when new apps access the network, look out for...
TinyWall - Lightweight and non-intrusive firewall
Little Snitch - Little Snitch is a firewall application that monitors and controls outbound internet traffic.
Radio Silence - Radio Silence is a network monitor and firewall for the macOS. The software stops apps from making network connections. The firewall runs in the background and does not require an open window.
Loading - See when apps are using your network in your Mac menubar
Windows 10 Firewall Control - Windows 10 Firewall Control: simple and exhaustive solution for applications network activity controlling and monitoring.