Front-end

Bourbon is a library of pure Sass mixins and functions that are designed to make you a more efficient style sheet author.

Foundation is a family of responsive front-end frameworks that make it easy to design beautiful responsive websites, apps and emails that look amazing on any device. Foundation is semantic, readable, flexible, and completely customizable.

A design element gallery for web designers and web developers. Find snippets using HTML, CSS, Javascript, jQuery, and Bootstrap.

The world’s most popular front-end open source toolkit, featuring Sass variables and mixins, responsive grid system, extensive prebuilt components, and powerful JavaScript plugins.

Pixel perfect mobile UI components built with Tailwind CSS With iOS and Material Design components for React, Vue & Svelte

Evergreen is a React UI Framework for building ambitious products on the web. Made by Segment in San Francisco, CA.

Ionic Framework's app development platform builds amazing cross-platform mobile, web, and desktop apps all with one shared code base and open-web standards.

Build Web Apps With HTML. Remake is a web app framework that makes it possible to ship a product faster than ever.

Stimulus is a JavaScript framework with modest ambitions. It doesn’t seek to take over your entire front-end—in fact, it’s not concerned with rendering HTML at all. Instead, it’s designed to augment your HTML with just enough behavior to make it shine.

The Progressive JavaScript Framework. An approachable, performant and versatile framework for building web user interfaces.

Free and open source framework to develop mobile, desktop or web apps with native look and feel. It is also an indispensable prototyping tool to show working app prototype as soon as possible.

Theme UI is a library for creating themeable user interfaces based on constraint-based design principles. Build custom component libraries, design systems, web applications, Gatsby themes, and more with a flexible API for best-in-class developer ergonomics.

Storybook is an open source tool for building UI components and pages in isolation. It streamlines UI development, testing, and documentation.

World's first Design-System-as-a-Service platform. Build, maintain and deliver your design system to all your product teams, blazing fast

Specify helps you unify your brand identity by collecting, storing and distributing design tokens and assets for your design system — automatically.

Formspree is a form backend, API, and email service for HTML & JavaScript forms. It’s the simplest way to embed custom contact us forms, order forms, or email capture forms on your static website.

Drag and drop form building

Collect submissions, receive emails and connect your HTML form with popular apps. Perfect for JAMStack and API-driven static websites. No form backend

The Workday Canvas Design System provides designers and developers with tools to create exceptional experiences.

Assets for building high-quality, consistent user experiences at Thumbtack.

The design system that powers GitHub. We love it so much, we chose to open-source it to allow the community to design and build their own projects with Primer.

The cohesive design language, shared vocabulary, and building block components to accelerate the building of Pluralsight products.

The definitive guide to standardize the design/code of the UI Components based on the 39 most popular Reference Systems.

Prism is a lightweight, extensible syntax highlighter, built with modern web standards in mind. It’s used in millions of websites, including some of those you visit daily.

Swiper is the most modern free mobile touch slider with hardware accelerated transitions and amazing native behavior.

Dynamic (JSON powered) form library for Angular that bring unmatched maintainability to your application's forms.

React hooks and components for hassle-free form validation. The world's leading companies use Formik to build forms and surveys in React and React Native.

An enterprise-class UI design language and React UI library with a set of high-quality React components, one of best React UI library for enterprises

Lottie is a library for Android, iOS, Web, and Windows that parses Adobe After Effects animations exported as json with Bodymovin and renders them natively on mobile and on the web

A visualizer to help you learn how the DOM Event system works through exploration