Postman - The Collaboration Platform for API Development
JunoRestClient - JunoRestClient helps you to create, organize and test your REST API quickly.
Insomnia REST - The most intuitive cross-platform REST API Client ð´
RESTer - A REST client for almost any web service (Firefox and Chrome extension).
Postman Workspaces - Organize and speed up API development work
Hoppscotch - Open source API development ecosystem