Open source. Open possibilities.

PlayCanvas PCUI is an MIT-licensed UI component library for web tools, offering fully styled components, React wrappers, observer-based data binding, Storybook examples, font theming, and UMD bundle support.

Tabler is a free, MIT-licensed HTML dashboard UI kit built on Bootstrap 5, offering ready-made layouts, components and 120+ demo pages for admin panels, dashboards and web apps, with dark mode, RTL stylesheets, Sass sources and TypeScript types.

Oruga is a lightweight Vue.js 3 UI component library with no CSS framework dependency. It provides customizable components, tree-shaking, themes, and class-mapping configuration for integrating Tailwind, Bulma, Bootstrap, or custom styles.

Webcore UI is an open-source component library for Astro, Svelte, and React. It uses Sass for styling and offers customizable components, blocks, templates, a CLI, themes, and CSS variables.

Blueprint is a React-based UI toolkit optimized for building complex, data-dense web interfaces for desktop applications.

Nebular is a customizable Angular UI library based on the Eva Design System, offering 4 visual themes, 35+ Angular UI components, a theming engine with runtime theme switching and CSS custom properties mode, plus Eva Icons SVG support and configurable authentication strategies.

Primer CSS is the CSS implementation of GitHub's Primer Design System, distributed as the @primer/css npm package. It provides Sass/SCSS source files with utility classes and component styles for core, product and marketing contexts. The project is now in maintenance (KTLO) mode.

A large-scale single-page application (SPA) example of a food delivery platform built with Vue 2 and Vuex. Featuring 45 pages, it covers the full workflow from location selection and merchant lists to search filtering, shopping cart, ordering, and user profiles. Accompanied by a Node.js backend and management dashboard, it serves as a comprehensive learning resource for large Vue applications.

Chatwoot is an open-source, self-hosted customer support platform and omnichannel help desk, positioned as an alternative to Intercom, Zendesk and Salesforce Service Cloud. It unifies live chat, email and social channels into one inbox, with an AI agent, help center, automation and reporting.

Spruce CSS is an open-source, lightweight Sass-based CSS design system and framework offering variables, mixins, functions, few utility classes and CSS custom property theming with dark mode.

Helsinki Design System (HDS) is an open-source design system from the City of Helsinki, offering accessible React components, CSS styles and design tokens, alongside documentation and design resources.

Bootstrap is a widely used open-source front-end framework for building responsive, mobile-first websites. It provides compiled and source CSS, JavaScript components, utility classes, and theming tools, with options for install via npm, Composer, NuGet and more.