HTTPScoop - HTTP Scoop is a Mac network sniffer that displays requests to websites along with the response, and...
Charles Proxy - HTTP proxy / HTTP monitor / Reverse Proxy
uProxy - Internet without borders. A safer path to Internet.
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.
Burp Suite - Burp Suite is an integrated platform for performing security testing of web applications.
Weer - A HTTP protocol debugger with Chrome DevTools frontend interface