TinyWall - Lightweight and non-intrusive firewall
Charles Proxy - HTTP proxy / HTTP monitor / Reverse Proxy
GlassWire - Visualize network activity in detail, get notified when new apps access the network, look out for...
Wireshark - Wireshark is a network protocol analyzer for Unix and Windows. It lets you capture and interactively browse the traffic running on a computer network.
Windows Firewall Control - Windows Firewall Control is not the built in firewall system in the Windows operating systems.
Postman - The Collaboration Platform for API Development