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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.
If you look closely at the code of my framework (LUB CSS), it has the architecture outlined below. As you can see, it only focuses on layout and utility classes. Blocks and exceptions are very project-specific, and often tied to UI components. Therefore they are left out of scope in this framework. However, there are many ways how you can add blocks in conjunction with this framework to a project. You can add a directory to the framework, but I would suggest co-locate it near the corresponding UI components. You could do this via CSS modules, styled-components, scoped styles in Svelte, etc.
I am a not utility-first guy. But 80% of my CSS code is utilities these days. The remaining parts consist of CSS targeting layouts (e.g. grids) and blocks that could be solved with utilities (e.g. using operators like + or ~). At this point, I came across the CUBE CSS of Andy Bell. It is the methodology describing how I was, and still am, implementing CSS. So as every self-respecting front-end developer with an online presence, I took it, changed it, created a framework, and wrote about it!