Postman - The Collaboration Platform for API Development
Insomnia REST - The most intuitive cross-platform REST API Client ð´
Thunder Client - Rest API client for VS Code, lightweight Postman alternative
Assertible - Assertible software provides you with a simple and quick way to monitor your web services. It comes with automated QA tools that users can utilize to test and monitor their web services on different platforms and environments.
Swagger Inspector - Free online tool to test APIs and autogenerate documentation
Run in Postman Button - Test public APIs with one click