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Little Snitch - Little Snitch is a firewall application that monitors and controls outbound internet traffic.
Fiddler - Fiddler is a debugging program for websites.
TripMode - Manage your Mac's broadband usage while on a hotspot
Proxyman.io - Proxyman is a high-performance macOS app, which enables developers to view HTTP/HTTPS requests from apps and domains.
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.
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.