Postman - The Collaboration Platform for API Development
Requester - HTTP client plugin for Sublime Text with an expansive feature set, modern UX, elegant syntax and...
Insomnia REST - The most intuitive cross-platform REST API Client ð´
API Test Base - API test automation tool that has GUI, supports HTTP stubs (mock services), data driven testing, and API types beyond HTTP, such as relational database, JMS, FTP(s), AMQP, MQTT, etc.
Hoppscotch - Open source API development ecosystem
soapUI - SoapUI Pro is one of the most prominent API testing platforms around, allowing developers to quickly prototype the functions of their apps and get them to market with little hassle.