If you've ever wished you could earn a Computer Science degree without the tuition bills, computer-science by @ossu is the closest thing to the real deal — completely free and entirely self-paced.

With over 203,209 stars on GitHub, the OSSU Computer Science curriculum is one of the most popular open-source learning paths online. It aggregates the best free courses from top universities (MIT, Harvard, Stanford, and more) into a structured, nine-course roadmap that takes you from the fundamentals all the way to advanced topics.

• Completely free — every course links to free textbooks, lectures, and resources. No hidden costs, no subscriptions.
• University-caliber quality — each course is handpicked from elite institutions, not random YouTube tutorials.
• Full CS breadth — covers math foundations, programming, algorithms, operating systems, databases, networking, and software engineering.
• Project-based learning — every course includes hands-on projects that build your portfolio as you progress.
• Community-driven — backed by a large open-source community with active discussions and code reviews.

Clone the curriculum and pick your path:

# Browse the full curriculum
git clone https://github.com/ossu/computer-science
cd computer-science

# Or explore the curriculum online
# https://github.com/ossu/computer-science

The curriculum is organized into three levels:

• Intro CS — Python, Java, or C++ foundations for complete beginners
• Core CS — 9 subjects including data structures, algorithms, OS, networking, and databases
• Advanced CS — compilers, security, machine learning, and specialized electives

Whether you're a career changer, a bootcamp graduate filling knowledge gaps, or a curious learner exploring computer science for the first time, the OSSU curriculum gives you a battle-tested roadmap backed by over 200,000 developers worldwide. Start today — your future self will thank you.

This project is created by @ossu — View on GitHub