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Free Code Camp's open source community help you build a job-worthy portfolio of real apps used by real people, while helping nonprofits.

Download and solve practice problems in over 30 different languages. For code newbies and experienced programmers.

LeetCode is a platform for learning and improving coding skills with the goal of being fully prepared for programming interviews. Choose problems to solve from categories such as System Design, Algorithms and Database, join code contests and engage in mock interviews.

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KiCad is an open source software suite for electronic design automation (EDA) - designing schematics of electronic circuits and printed circuit boards (PCB). KiCad is developed by Jean-Pierre Charras. And features an integrated environment between schematic capture, bill of...