Postman - The Collaboration Platform for API Development
HttpMaster - HttpMaster is a professional software tool for testing and debugging HTTP applications, primarily aimed at REST API applications and web services.
Insomnia REST - The most intuitive cross-platform REST API Client ð´
Hoppscotch - Open source API development ecosystem
RESTer - A REST client for almost any web service (Firefox and Chrome extension).
Request inspector - Debug web hooks, http clients