For those more detailed screen recordings like demos as well as bugs. Has a built in editor.

SeleniumBase Case Plans is Test Case Management Software that uses Markdown tables for displaying test plans directly in GitHub (and other source code management systems that support Markdown format).

Use Espresso to write concise, beautiful, and reliable Android UI tests.

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

Unifying API testing, API Performance testing, API Mocks and UI testing.

The Apache JMeter™ application is open source software, a 100% pure Java application designed to load test functional behavior and measure performance. It was originally designed for testing Web Applications but has since expanded to other test functions.