Appium is an open-source project and ecosystem of related software, designed to facilitate UI automation of many app platforms

Requestly is an open-source tool that simplifies API development, testing, mocking, and integration for developers and QAs.

Design, debug, and test APIs locally or in the cloud

Release High-Quality Apps, With Confidence Perfecto is a proven, enterprise test automation platform for powering 5-star mobile applications.

TestMu AI (Formerly LambdaTest) is a fully autonomous agentic quality engineering platform that empowers teams to test intelligently, smarter, and ship faster.

Burp or Burp Suite is a set of tools used for penetration testing of web applications. It is developed by a company named Portswigger who make freely available a Web Security Academy which has a range of lessons on penetration testing.