Charles Proxy - HTTP proxy / HTTP monitor / Reverse Proxy
TrafficMonitor - TrafficMonitor is a network monitoring suspension window software in Windows.
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.
NetBalancer - NetBalancer is a Windows application for local network traffic control and monitoring.
Postman - The Collaboration Platform for API Development
NetTraffic - Essential network bandwidth monitor.