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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.
It doesn't 'look' any way. It's a protocol. Think of it like email. Email doesn't look any particular way, the client itself is what gives the UX. Start with Element, it's FOSS: https://element.io/
check out twake.app and also talkyard.io which looks more like a forum but has live chat. Both are opensource. And twake specifically has an OnlyOffice integration, which means you can also have a collaborative document editing & management system, if you want to build a knowledgebase.
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