10 Most Popular Open-Source Testing & Automation Frameworks
The most-starred open-source testing and automation frameworks — Playwright, Cypress, pytest, Jest, k6 and more — with GitHub links and star counts.
By The DevFixPro Editorial Team · independent editorial research project
Star counts retrieved from the GitHub API on 2026-08-17. Open-source projects grow daily, so treat the numbers as a snapshot — always check the linked repository for the latest figures, license, and activity.
Shipping without tests is gambling. The 10 open-source testing and automation frameworks below are ranked by GitHub stars (fetched 2026-08-17) — end-to-end, unit, API and load testing. Each links to its repository.
Pick by layer: Playwright/Cypress/Selenium for the browser, pytest/Jest/Vitest for units, and k6 for load — wire them into CI so regressions surface early.
