Bootstrap

CivicTheme is an open-source, inclusive, and component-based design system created for governments and corporations. It aims to help organizations rapidly assemble modern, consistent, and compliant digital experiences. CivicTheme focuses on accessibility, ensuring that websites built with it meet high standards for usability across diverse user groups. It provides a set of reusable components and design patterns that adhere to government and corporate design guidelines.

A rich set of open-source UI Components for Vue.js.

Animate.css is a ready-to-use library of CSS animations. It provides a set of cross-browser animations that can be easily applied to HTML elements to add dynamic effects to web pages. The library includes a wide range of animations, from subtle fades to attention-grabbing bounces and flips. Animate.css is lightweight, easy to implement, and can significantly enhance the visual appeal of websites with minimal effort.

shadcn/ui is a collection of re-usable components built using Radix UI and Tailwind CSS. It's not a component library in the traditional sense, but rather a set of beautifully designed, accessible components that developers can copy and paste into their projects. This approach allows for maximum customization and integration with existing codebases. shadcn/ui is particularly popular among developers who want high-quality, customizable components without the overhead of a full UI framework.

MUI, formerly known as Material-UI, is a popular React UI framework that implements Google's Material Design. It provides a comprehensive suite of UI tools and pre-built React components that can be easily customized. MUI aims to provide a robust, customizable, and accessible library of foundational and advanced components, enabling developers to build feature-rich applications faster. It's known for its extensive documentation, active community, and adherence to Material Design principles while offering flexibility for custom designs.