Charles Proxy - HTTP proxy / HTTP monitor / Reverse Proxy
ngrok - ngrok enables secure introspectable tunnels to localhost webhook development tool and debugging tool.
HTTP Toolkit - Beautiful, cross-platform & open-source tools to debug, test & build with HTTP(S). One-click setup for browsers, servers, Android, CLI tools, scripts and more.
GlassWire - Visualize network activity in detail, get notified when new apps access the network, look out for...
Weer - A HTTP protocol debugger with Chrome DevTools frontend interface
TrafficMonitor - TrafficMonitor is a network monitoring suspension window software in Windows.