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soapui
SoapUI is a free and open source cross-platform functional testing solution for APIs and web services.
SoapUI is recognized as one of the best SaaS testing tools for API testing, excelling in both functionality and security assessments. It supports both REST and SOAP protocols, making it a versatile choice for developers and testers alike.
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SaaSHub
SaaSHub - Software Alternatives and Reviews. SaaSHub helps you find the best software and product alternatives
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Postman is recognized as one of the best SaaS testing tools, specifically tailored for API development, testing, and documentation. It offers a comprehensive suite of features designed to manage APIs at every stage of the development lifecycle.
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Apache JMeter
Apache JMeter open-source load testing tool for analyzing and measuring the performance of a variety of services
JMeter is a performance testing tool that allows the testing of SaaS software. It is freely available as open-source software, making it accessible to a wide range of users.