Testing and validating REST services in Java is harder than in dynamic languages such as Ruby and Groovy. REST Assured brings the simplicity of using these languages into the Java domain.

RapidAPI for Mac is a full-featured HTTP client that lets you test and describe the APIs you build or consume. It has a beautiful native macOS interface to compose requests, inspect server responses, generate client code and export API definitions.

Robot Framework is a generic open source automation framework. It can be used for test automation and robotic process automation (RPA).

Design, debug, and test APIs locally or in the cloud

ReadyAPI is a low-code API testing platform for development teams that care about creating test automation across any workflow.

Bruno is a Fast and Git-Friendly Opensource API client, aimed at revolutionizing the status quo represented by Postman, Insomnia and similar tools out there.