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freeCodeCamp is a free, self-paced curriculum for learning to code, published as open source at freeCodeCamp/freeCodeCamp. It's a 501(c)(3) nonprofit funded by donor support, structured around six certifications in its Full-Stack Developer Curriculum, each gated by required projects instead of open-book quizzes. The repository also carries beta language certifications for developers, interview-prep resources, and the code that runs the live freecodecamp.org platform.

Storybook is a frontend workshop maintained at storybookjs/storybook, with 90,840 stars and 10,387 forks on GitHub. It renders UI components and pages in isolation from your main application. Core renderers include React, Angular, Vue 3, Web Components, HTML, Ember, Svelte, and Preact, plus React Native and community support for Qwik and SolidJS. It's released under the MIT license.

Awesome React (enaqx/awesome-react) is a curated-list GitHub repository that catalogs frameworks, component libraries, state management tools, styling options, testing tools, and React Native packages for the React ecosystem. It also includes a Real Apps section pointing to production software built with React, plus a Contribution section explaining the project's history and rules.

📜 33 JavaScript concepts every developer should know.