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Looking at https://delassus.com/javascripts/app.js you can see they used hammer.js(https://hammerjs.github.io/) to achieve the gestures, which I am assuming is your focus here.
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It also looks like https://greensock.com and https://github.com/pixijs are loaded for some animations.
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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.
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Hence, a higher number means a more popular project.