Postman - The Collaboration Platform for API Development
Insomnia REST - The most intuitive cross-platform REST API Client ð´
TestMace - Powerful IDE to work with API.
RESTer - A REST client for almost any web service (Firefox and Chrome extension).
Hoppscotch - Open source API development ecosystem
Proxyman.io - Proxyman is a high-performance macOS app, which enables developers to view HTTP/HTTPS requests from apps and domains.