Not your average UI framework, but a minimalist, one-size-does-not-fit-all, lightweight, responsive, modern, opinionated, Flex-based framework.
I’ve been building, iterating and refining this UI library for more than 6 years. I’ve called it Thin UI. After being in alpha state for more than a year, and then in a beta state for several months, I have updated it to avoid any possible conflict and published it.
I am using it in more than 100 projects, starting from basic, static HTML/PHP to Hound CMS and WordPress.
It’s opinionated, as in I’m using what I think is best for performance and modern browser compatibility. There’s room for growth and improvement, but for the moment I am keeping it “thin” as I am using it in several heavily-optimized projects, so I need only the basics, i.e. a powerful FlexCSS grid, form elements, buttons, tabs and popovers.