1. Bootstrap

Bootstrap offers a robust collection of CSS and JavaScript components, such as its grid system and responsive UI components.

2. Bulma

Bulma is a modern CSS framework based on Flexbox known for its simplicity, clean syntax, and ease of use.

3. Foundation

Foundation Features a responsive grid system, a wide range of UI components, and advanced features like interchangeable layouts and modular architecture. Foundation is the closest alternative to Bootstrap.

4. Tailwind CSS

Tailwind CSS is a utility-first CSS framework that provides low-level utility classes to style web applications. As a utility-first framework, Tailwind abstracts from the constraints of a component-based framework, for example, Bootstrap.

5. Material UI

Material UI is a component-based CSS framework for building user interfaces in React applications. It is based on Google’s open- source design system, Material Design, and provides a rich collection of pre-built components and styles.