1. Tailwind CSS
Tailwind CSS is a utility-first CSS framework that is different than other frameworks like Bootstrap where you get pre-designed components. Tailwind requires the least amount of learning and is easy to use.
2. Bootstrap
Bootstrap is the most popular CSS framework globally and got instant popularity because of its responsive design. Almost anything, from alerts to modals to navigation bars, is supported by default making is easy to build amazing websites.
3. Foundation
Foundation is the perfect choice for experienced developers who enjoy freedom but want the power of a fully-featured framework. It is much suitable for huge web applications that need a lot of styling.
https://get.foundation
4. Bulma
Bulma is a great alternative to Bootstrap, as it features modern code and a unique aesthetic. It’s easy to use and import into your projects and comes with various pre-made components. IMO, Bulma is the best-looking CSS framework on this list.
5. UIKit
UIKit is a modular frontend framework that allows you to import only the features you need. UIKit contains dozens of components, allowing you to implement complex frontend layouts. It can be easily customized using SASS.
6. Milligram
Milligram is a minimalist CSS framework that has a tight community of developers around it. Even though it offers powerful features to boost productivity, it comes with a very low weight of 2 KB when compressed.
7. Pure
The Pure CSS framework is surprisingly tiny, as it only takes up 3.7 KB (compressed) when all modules are used. It offers reusable and responsive CSS modules that can be added to any web project. Pure comes with responsive pre-made components.
8. Tachyons
Tachyons is a lesser-known CSS framework that includes advanced utility classes and provides you with dozens of ways to use them. Tachyons helps you understand your project’s design patterns and promote reusability throughout your project.
http://tachyons.io
9. Materialize CSS
It features many interactive components that speed up work and help deliver a great UX. Animations are used throughout the framework to provide visual feedback to users, in a way that’s easy for developers to work with. https://materializecss.com
10. Semantic UI
Semantic UI is another one of the good CSS frameworks released in 2013 by Jack Lukic. It contains pre-built semantic components that are super helpful in creating a beautiful and responsive layout using friendly HTML syntax.
https://semantic-ui.com