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responsively-app
A modified web browser that helps in responsive web development. A web developer's must have dev-tool.
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Playwright
Playwright is a framework for Web Testing and Automation. It allows testing Chromium, Firefox and WebKit with a single API.
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SurveyJS
Open-Source JSON Form Builder to Create Dynamic Forms Right in Your App. With SurveyJS form UI libraries, you can build and style forms in a fully-integrated drag & drop form builder, render them in your JS app, and store form submission data in any backend, inc. PHP, ASP.NET Core, and Node.js.
Theres also https://responsively.app/ which is nice for screen sizes.
For automated testing, I guess Playwright can do the job, but I've not used it. https://playwright.dev/
NOTE:
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Hence, a higher number means a more popular project.