Stormy
A mixin-based utility toolkit built with SCSS. You can think of it as TailwindCSS without utility classes.
Motive
I felt like Tailwind and other utility-based CSS frameworks had a nice idea.
They gave you some default good looking utilities like shadow, rounded, gradients, etc. But they didn't integrate well into existing systems and they don't work well in large, enterprise design systems.
The benefit of using mixins is you can put them in other mixins, you can use them to create your own utility classes. However, the most important thing is that nothing is included unless you use it, unlike the others mentioned above where everything is included and purged when building.
Usage
See the documentation to learn how to install and use Stormy