Surge for Mac - Advanced Web Debugging Proxy for Mac & iOS
Weer - A HTTP protocol debugger with Chrome DevTools frontend interface
Charles Proxy - HTTP proxy / HTTP monitor / Reverse Proxy
HTTP Headers - HTTP Headers allows you to quickly see the HTTP header information for the current URL.
HTTP Analyzer - undefined
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.