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Fiddler - Fiddler is a debugging program for websites.
Graphical HTTP Client - Graphical Http Client is a utility to help you test and interact with REST-based web services.
Proxyman.io - Proxyman is a high-performance macOS app, which enables developers to view HTTP/HTTPS requests from apps and domains.
Postman - The Collaboration Platform for API Development
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.
Cocoa Rest Client - A free open source, native Apple OS X app for testing HTTP/REST endpoints