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Master programming by recreating your favorite technologies from scratch.

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.

EbookFoundation/free-programming-books is a community-curated index of free learning materials for developers. What began as a Stack Overflow list has grown into a comprehensive resource, now overseen by the Free Ebook Foundation. It categorizes a wide range of content, including books by language and subject, free online courses, cheat sheets, interactive programming tutorials, problem sets, podcasts, screencasts, and browser-based programming playgrounds. Many of these resources are available in dozens of languages beyond English, and you can navigate the collection through its dedicated search website or by browsing the repository's markdown files.

Project Based Learning is a GitHub repository maintained by practical-tutorials that curates external tutorials for building real applications from scratch, organized by primary programming language such as C/C++, Java, and JavaScript. Rather than hosting original lessons, the README lists direct links to blog posts, book chapters, and video series so a developer can pick a project and follow someone else's from-scratch build.