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react-draft-wysiwyg
A Wysiwyg editor build on top of ReactJS and DraftJS. https://jpuri.github.io/react-draft-wysiwyg
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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.
Tailwind already has modal example so I assume you are looking for rich text editor. Now library to use depends what your use case for editor is. If it is for editing code or json then @monaco-editor/react fits the bill very nicely. For more general content you can use react-draft-wysiwyg . I can provide more options if you specify what the editor will be used for.