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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.
That being said, htmx is about 3000 lines of mostly-understandable JavaScript. Really, the only two somewhat ugly parts of the code are history support and the somewhat fancy swapping model that enables CSS transitions. And it's basically baked at this point. I plan on adding a merge-style swap (https://github.com/bigskysoftware/idiomorph), better head merging and cleaning up some rough edges in htmx 2.0, but the core API shouldn't change at all and for most people 2.0 will be the same as a point release. At that point, htmx will be done done, and just another tool to use when building websites.