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Fiddler - Fiddler is a debugging program for websites.
Proxyman.io - Proxyman is a high-performance macOS app, which enables developers to view HTTP/HTTPS requests from apps and domains.
Firefox JavaScript Debugger - Firefox JavaScript Debugger is a rich-functional website monitoring tool that provides you an opportunity to step through JavaScript code and test or modify its state, helping in tracing the bugs from all over the network.
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.
Fluxguard - Deployment, Defacement, & Security Monitoring
mitmproxy - mitmproxy is an SSL-capable man-in-the-middle proxy for HTTP.