HyperTest is a no-code test automation tool that regresses all your APIs by auto-generating integration tests using your network traffic, also giving a way to reproduce these failures inside actual user-journeys.

Fully integrated API and web service testing capabilities that automate end-to-end functional API testing.

All-in-one test management solution for both manual and automated software testing

NUnit is a unit-testing framework for all .Net languages.

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

SelectorsHub is the Next Gen XPath Plugin & Selectors tool. It supports all kinds of XPath, locators, shadow dom, iframe, svg, dynamic elements, multi selectors generation and xpath error handling. It is a Free community product.