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   * [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
+  * [Gremlin](https://www.gremlin.com/gremlin-free-software) — Gremlin's Chaos Engineering tools allow you to safely, securely, and simply inject failure into your systems to find weaknesses before they cause customer-facing issues. Gremlin Free provides access to Shutdown and CPU attacks on up to 5 hosts or containers.
   * [gridlastic.com](https://www.gridlastic.com/) — Selenium Grid testing with free plan up to 4 simultaneous selenium nodes/10 grid starts/4,000 test minutes/month
   * [percy.io](https://percy.io) - Add visual testing to any web app, static site, style guide, or component library.  10 team members, Demo app and unlimited projects, 5,000 snapshots / month.
   * [saucelabs.com](https://saucelabs.com/) — Cross browser testing, Selenium testing and mobile testing, [free for Open Source](https://saucelabs.com/open-source)