oppia/oppia

Web Development for Beginners - A Curriculum is Microsoft's free, MIT-licensed course of 24 lessons spread across 12 weeks, covering JavaScript, CSS, and HTML. Built by Microsoft Cloud Advocates, it pairs quizzes with five hands-on projects, a terrarium, a typing game, a browser extension, a space game, and a banking app, and ships in 50+ language translations.

Storybook is a frontend workshop maintained at storybookjs/storybook. 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.

Strapi is a self-hosted headless CMS that auto-generates REST and GraphQL APIs from content model definitions you build visually with the Content-Type Builder — no code required on the API side. It ships with authentication, granular roles and permissions, a media library, i18n, and draft/publish workflows out of the box, and the request pipeline (Routes → Middlewares → Controllers → Services) is fully overridable at each layer. TypeScript is first-class and you can pair it with SQLite for local dev or PostgreSQL/MySQL/MariaDB in production. The plugin system and customizable admin panel are real extensibility points, not marketing. The tradeoff: there's no official Docker image (you roll your own from your project), and major version upgrades have been historically painful — the migration docs are thorough but the process still demands attention. Worth it if you need full control over your content infrastructure and don't mind owning the deployment; less ideal if you want something you can set and forget.

33 JavaScript Concepts organizes core JavaScript topics -- from primitive types to the event loop to design patterns -- into a linked list of focused explanations with code examples, aimed at developers filling gaps in their fundamentals.