SoapUI Open Source

SoapUI Open Source is the free, community edition of the tool that evolved into ReadyAPI. It remains a powerful, standalone tool for functional and load testing of SOAP and REST APIs. It provides a comprehensive GUI for creating and executing test suites, test cases, and load tests.

Its scripting capabilities using Groovy allow for advanced customization and logic. While the commercial ReadyAPI offers more features (security testing, advanced virtualization, integrations), the open-source version is remarkably capable for many testing needs. It's ideal for individuals, students, and teams with budget constraints who need a robust, free tool for testing SOAP-based web services and REST APIs, especially in environments where legacy SOAP services are prevalent.