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Bootstrap is the most popular HTML, CSS, and JS framework for developing responsive, mobile first projects on the web.

Material Design is a specification for a unified system of visual, motion, and interaction design that adapts across different devices. Our goal is to deliver a lean, lightweight set of AngularJS-native UI elements that implement the material design system for use in Angular SPAs.

It is a bunch of cool, fun, and cross-browser animations for you to use in your projects. Great for emphasis, home pages, sliders, and general just-add-water-awesomeness.

Tailwind is different from frameworks like Bootstrap, Foundation, or Bulma in that it's not a UI kit. It doesn't have a default theme, and there are no build-in UI components. It comes with a menu of predesigned widgets to build your site with, but doesn't impose design decisions that are difficult to undo.

Material UI is a library of React UI components that implements Google's Material Design.

Nuxt.js presets all the configuration needed to make your development of a Vue.js application enjoyable. You can use Nuxt.js for SSR, SPA, Static Generated, PWA and more.

Vuetify is a component framework for Vue.js 2. It aims to provide clean, semantic and reusable components that make building your application a breeze. Vuetify utilizes Google's Material Design design pattern, taking cues from other popular frameworks such as Materialize.css, Material Design Lite, Semantic UI and Bootstrap 4.

Foundation is the most advanced responsive front-end framework in the world. You can quickly prototype and build sites or apps that work on any kind of device with Foundation, which includes layout constructs (like a fully responsive grid), elements and best practices.

Semantic empowers designers and developers by creating a shared vocabulary for UI.

UIkit gives you a comprehensive collection of HTML, CSS, and JS components which is simple to use, easy to customize and extendable.

Bulma is a CSS framework based on Flexbox and built with Sass

A CSS Framework based on material design.

Material Design Lite (MDL) lets you add a Material Design look and feel to your static content websites. It doesn't rely on any JavaScript frameworks or libraries. Optimized for cross-device use, gracefully degrades in older browsers, and offers an experience that is accessible from the get-go.

Material Design is a unified system that combines theory, resources, and tools for crafting digital experiences.

It is a JavaScript toolkit that saves you time and scales with your development process. Provides everything you need to build a Web app. Language utilities, UI components, and more, all in one place, designed to work together perfectly.

Polymer is a new type of library for the web, designed to leverage the existing browser infrastructure to provide the encapsulation and extendability currently only available in JS libraries. Polymer is based on a set of future technologies, including Shadow DOM, Custom Elements and Model Driven Views. Currently these technologies are implemented as polyfills or shims, but as browsers adopt these features natively, the platform code that drives Polymer evacipates, leaving only the value-adds.

Blazor is a .NET web framework that runs in any browser. You author Blazor apps using C#/Razor and HTML.

Build responsive Single Page Apps, SSR Apps, PWAs, Hybrid Mobile Apps and Electron Apps, all using the same codebase!, powered with Vue.

Vue CLI aims to be the standard tooling baseline for the Vue ecosystem. It ensures the various build tools work smoothly together with sensible defaults so you can focus on writing your app instead of spending days wrangling with config.

It executes on the server, generating static application pages that later get bootstrapped on the client. This means that the application generally renders more quickly, giving users a chance to view the application layout before it becomes fully interactive.

It provides prebuilt Bootstrap 4 components that allow a great deal of flexibility and prebuilt validation. This allows us to quickly build beautiful forms that are guaranteed to impress and provide an intuitive user experience.

Build responsive, mobile-first projects on the web using Vue.js and the world's most popular front-end CSS library — Bootstrap V4.

A tiny CSS framework that preserves everything Skeleton, Milligram, and other micro frameworks have to offer.

This methodology was developed at Yandex with the goals in mind that Fast development and long-lasting results for standard projects,A project involves many people,Scalable teams,Code reuse.

It is a popular open source framework for JavaServer Faces featuring over 100 components, touch optimized mobilekit, client side validation, theme engine and more.

Flat UI is a beautiful theme for Bootstrap. We have redesigned many of its components to look flat in every pixel.

As a complete and self-sufficient web framework, it is here to help you get the most out of your daily work. It takes care of routine stuff, saving you precious time for things that you love.

Web components are a set of web platform APIs that allow you to create new custom, reusable, encapsulated HTML tags to use in web pages and web apps.

This template uses several libraries for charts, calendar, form validation, wizard style interface, off-canvas navigation menu, text forms, date range, upload area, form autocomplete, range slider, progress bars, notifications and much more.

It is an open source toolkit based on Bootstrap for developing Material Design apps with HTML, CSS, and JS. Quickly prototype your ideas or build your entire app with our Sass variables and mixins, responsive grid system, extensive prebuilt components, and powerful plugins built on jQuery.

Create fast loading, highly readable, and 100% responsive interfaces with as little CSS as possible.

Skeleton is a small collection of CSS files that can help you rapidly develop sites that look beautiful at any size, be it a 17" laptop screen or an iPhone.

An open-source library for web-based products. At JetBrains, we use Ring UI components for our web-based products like YouTrack, Hub, TeamCity, and Upsource.

mini.css is a lightweight CSS framework (under 7KB gzipped) designed with mobile devices and modern browsers in mind. Responsiveness, ease of use and customization are some of the main features of the framework, while accessibility and extensive documentation are some of the secondary focuses of the project.

Milligram provides a minimal setup of styles for a fast and clean starting point. Specially designed for better performance and higher productivity with fewer properties to reset resulting in cleaner code.

Pure is meant to be a starting point for every website or web app. We take care of all the CSS work that every site needs, without making it look cookie-cutter.

Toolkit makes use of the latest and greatest technology. This includes HTML5 for semantics, CSS3 for animations and styles, Sass for CSS pre-processing, Gulp for task and package management, and powerful new browser APIs for the JavaScript layer.

Foundation for Apps is a framework you can use to build better, more polished single-page web applications that work across many devices. We’ve taken what we’ve learned from building the original Foundation framework to build an entirely new framework just for web apps.

It is a next-generation utility-first CSS framework. If you are already familiar with Tailwind CSS, think about it as an on-demanded alternative to Tailwind, which provides faster load times, fully compatible with Tailwind v2.0 and with a bunch of additional cool features.

Material Kit is a Free Bootstrap UI Kit with a fresh, new design inspired by Google's material design. You asked for it, so we built it. It's a great pleasure to introduce to you the material concepts in an easy to use and beautiful set of components. Along with the restyling of the Bootstrap elements, you will find three fully-coded example pages, to help you design your next project.

Avalonia is a multi-platform windowing toolkit - somewhat like WPF - that is intended to be multi- platform. It supports XAML, lookless controls and a flexible styling system, and runs on Windows using Direct2D and other operating systems using Gtk & Cairo.

UX guidelines, HTML/CSS framework, and Angular components working together to craft exceptional experiences. Start building with our HTML/CSS framework and rapidly go from prototype to production.

It is a fast reactive Desktop and Web UI framework for Kotlin, based on Google’s modern toolkit. It simplifies and accelerates UI development for Desktop and Web applications, and allows extensive UI code sharing between Android, Desktop, and Web.

It a UI framework that is resolution-independent and uses a vector-based rendering engine, built to take advantage of modern graphics hardware.

It is Free and Open Source. It does not change or add any CSS to the already one fromTailwindCSS. It features multiple HTML elements and it comes with dynamic components for ReactJS, Vue and Angular.

This UI framework uses core Web Components standards and provides only what’s necessary to perform well in browsers. Because it’s built on code that runs natively in browsers, the framework is lightweight and delivers exceptional performance. Most of the code you write is standard JavaScript and HTML.

It helps you and your team build thoughtful, pattern-driven user interfaces using atomic design principles.

Primer is the basecoat of GitHub, made by nerds just like you who share a passion for HTML and CSS.

SUIT CSS provides a reliable and testable styling solution for component-based web application development.

iView is a set of UI components and widgets built on Vue.js. Dozens of useful and beautiful components.