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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.
2 June 2021 - Fern.team - Wappalyzer tells me this site has been created using Webflow, which "empowers designers to build professional, custom websites in a completely visual canvas with no code". Webflow is a paid-for service, thus technically out of scope for the question, but the site animation is mainly video and gif images controlled by a scroll effect. Under the hood, the site is loading Anime.js which is open source.
3 June 2021 - steventaylor.com - this is a Wordpress site whose landing page seems to be mostly an intro video. Additional animation handled by GSAP and Highway.js. These and WP are all open source.
... GSAP, Highway and Anime are all on GitHub, where you can check through their source code.