Fiddler - Fiddler is a debugging program for websites.
Jott - Fast, local, linked notes
Proxyman.io - Proxyman is a high-performance macOS app, which enables developers to view HTTP/HTTPS requests from apps and domains.
Havoc Shield - Cybersecurity built for startups and small business in an affordable, all-in-one suite of tools. Put a cybersecurity program in place in under a week to protect your business from ransomware and cybersecurity attacks.
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.
mitmproxy - mitmproxy is an SSL-capable man-in-the-middle proxy for HTTP.