5.0 is a REST-focused release. Big theme is “taming undocumented APIs” with REST Discovery feature. REST API protocol growing fast. SoapUI has supported REST since 2.5, and now SoapUI, despite the name, is an awesome REST-testing tool.
SoapUI, is the world leading Open Source Functional Testing tool for API Testing. It supports multiple protocols such as SOAP, REST, HTTP, JMS, AMF and JDBC. It supports functional tests, security tests, and virtualization.