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geckos.io
🦎 Real-time client/server communication over UDP using WebRTC and Node.js http://geckos.io
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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.
socket.io is likely the bottleneck, if node.js is the only option switch to websockets (ws) or better uWebsockets.js pub/sub with redis pub/sub for scaling
First, I would try exchange Socket.io over Geckos - https://github.com/geckosio/geckos.io.
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Hence, a higher number means a more popular project.