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

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).

Checks web UI for browser compatibility (Compliance with Can I Use?)

A modern, resource-friendly REST client for Windows 10

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

Test, scrape, generate, and automate without the pain and expense of hosting your own headless browsers.