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tsParticles
tsParticles - Easily create highly customizable JavaScript particles effects, confetti explosions and fireworks animations and use them as animated backgrounds for your website. Ready to use components available for React.js, Vue.js (2.x and 3.x), Angular, Svelte, jQuery, Preact, Inferno, Solid, Riot and Web Components.
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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.
At first, I attempted to create my own particle effect, but I realized it's actually a lot harder than it seems. So I went with a third-party library that is made specially for particles. You can check out the repo https://github.com/matteobruni/tsparticles. They have lots of neat effects.