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API Fortress - API performance, accuracy, and uptime testing. Without code.
REST-Assured - 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.
HttpMaster - HttpMaster is a professional software tool for testing and debugging HTTP applications, primarily aimed at REST API applications and web services.
Hoppscotch - Open source API development ecosystem
Airborne - RSpec driven API testing framework.
RestCase - Secure REST API Rapid Development Platform