WindPress
WindPress brings Tailwind CSS v3 and v4 to WordPress with no build step: use utility classes in the block editor, page builders like Etch, plugins and themes. Free on WordPress.org, Pro version by Jooosi.
ACSS – Automatic.css
Automatic.css is a utility CSS framework for WordPress page builders that speeds up website development by providing pre-built classes for spacing, typography, and layouts, eliminating repetitive CSS coding.