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   * [lambdatest.com](https://www.lambdatest.com/) — Manual, visual, screenshot and automated browser testing on selenium and cypress, [free for Open Source](https://www.lambdatest.com/open-source-cross-browser-testing-tool)
   * [browserstack.com](https://www.browserstack.com/) — Manual and automated browser testing, [free for Open Source](https://www.browserstack.com/open-source?ref=pricing)
   * [checkbot.io](https://www.checkbot.io/) — Browser extension that tests if your website follows 50+ SEO, speed and security best practices. Free tier for smaller websites.
+  * [checklyhq.com](https://checklyhq.com) - Checkly is the API & E2E monitoring platform for the modern stack: programmable, flexible and loving JavaScript. Generous free tier for devs.
   * [crossbrowsertesting.com](https://crossbrowsertesting.com) - Manual, Visual, and Selenium Browser Testing in the cloud - [free for Open Source](https://crossbrowsertesting.com/open-source)
   * [cypress.io](https://www.cypress.io/) - Fast, easy and reliable testing for anything that runs in a browser. Cypress Test Runner is always free and open source with no restrictions and limitations. Cypress Dashboard is free for open source projects for up to 5 users.
   * [everystep-automation.com](https://www.everystep-automation.com/) — Records and replays all steps made in a web browser and creates scripts,... free with fewer options