aDesigner is a disability simulator that helps designers ensure that their content and applications are accessible and usable by the visually impaired.

k6 Open Source is designed for load testing. Extensible to support other types of testing.

Hoppscotch is an open-source API development ecosystem that helps you create and test your API requests saving precious time in development.

Built for developers and testers alike, SoapUI is the only open source tool that covers the entire testing spectrum (functional, security, load, mocking).

YATTIE exists to help make tester's lives easier. Ideally, it should remove friction from the exploratory testing process - everywhere from gathering evidence to submitting reports.

Robot Framework is a generic open source automation framework. It can be used for test automation and robotic process automation (RPA).