Front-end

A design system for building faithful recreations of old UIs.

CSS library for building interfaces that resemble Apple's System OS which ran from 1984-1991.

Welcome to the Whitebox Geospatial. The home of the open-source, fast, innovative, and company geospatial software, WhiteboxTools.

OpenLayers makes it easy to put a dynamic map in any web page, for free. It can display map tiles, vector data and markers loaded from any source.

Leaflet is a modern, lightweight open-source JavaScript library for mobile-friendly interactive maps.

Maps for your apps. You need reliable, accurate, high-quality maps for your applications and websites. We have great maps, APIs and services ready for you.

MapLibre is a community-governed collection of open source mapping libraries

Shoelace provides a collection of professionally designed, every day UI components built on a framework-agnostic technology.

The Auro Design System is an eco-system of design, core utilities, and web components designed to reduce design and development efforts.

Hilla is a modern framework for Java that integrates a Spring Boot Java backend with a reactive TypeScript frontend. It includes all the UI components and tools you need so you can focus on building your app.

CSS Code Golfing Game is here! Use your CSS skills to replicate targets with smallest possible code. Feel free to check out the targets below and put your CSS skills to test.

The fastest and easiest way to check, copy and edit CSS. Goodbye to "Inspect Element" — Visualize the CSS of any element you hover over, instantly, and copy its entire rules with a single click.

A collection of CSS3 powered hover effects to be applied to links, buttons, logos, SVG, featured images and so on. Easily apply to your own elements, modify or just use for inspiration. Available in CSS, Sass, and LESS.

Simple. Fast. Web Components. Lit is a simple library for building fast, lightweight web components. At Lit's core is a boilerplate-killing component base class that provides reactive state, scoped styles, and a declarative template system that's tiny, fast and expressive.

Materialize is a modern responsive CSS framework based on Material Design by Google.

Design System Fundamentals. Magnifying glass. Component Blueprints. Ready-to-use HTML and CSS UI elements provide the foundation for Salesforce experience

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