DOMScope
Chrome DevTools
Firefox Developer Tools
Browsersync
Ghostlab
SplineTech Javascript Debugger
Muir
Code Cola
Charles Proxy
Fiddler
Proxyman.io
HTTP Toolkit
Surge for Mac
mitmproxy
nginx
Weer
DOMScope
Charles ProxyChrome DevTools - Get started with Google Chrome's built-in web developer tools.
Fiddler - Fiddler is a debugging program for websites.
Firefox Developer Tools - Examine, edit, and debug HTML, CSS, and JavaScript on the desktop and on mobile.
Proxyman.io - Proxyman is a high-performance macOS app, which enables developers to view HTTP/HTTPS requests from apps and domains.
Browsersync - Browsersync makes your tweaking and testing faster by synchronising file changes and interactions...
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.