Hands-on coding exercises, challenges, and real-world practice platforms.
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Free Resources (25)
- Aizu Online Judge Free
- Contest platform and problem archive from the University of Aizu featuring programming contest problems.
- AtCoder Free
- Japanese competitive programming contests and practice problems.
- CodeChef Free
- Competitive programming platform with monthly contests and practice problems.
- Codeforces Free
- Competitive programming contests with real-time rating system.
- CodeKata Free
- Dave Thomas's collection of coding katas designed to build skill through deliberate practice and repetition.
- Codewars Free
- Community-driven coding challenges (katas) in multiple programming languages.
- CodinGame Free
- Gamified coding challenges and programming puzzles with multiplayer.
- CodingBat Free
- Free practice problems for Java and Python with instant testing.
- CS Academy Free
- Online judge hosting biweekly contests with live chat, interactive lessons, and an integrated online editor.
- DevChallenges Free
- Project-based coding challenges for front-end, full-stack, and responsive web development with design specs.
- Exercism Free
- Free code mentorship and practice in 70+ programming languages with mentor feedback.
- Exercism - Mentoring Free
- Free one-on-one mentorship for code improvement in 70+ languages.
- Gophercises Free
- Free Go programming course with hands-on mini-projects teaching the language through building small apps.
- Interviewing.io Free
- Free anonymous technical interview practice with real engineers.
- JSChallenger Free
- Focused JavaScript exercises covering arrays, dates, objects, and DOM manipulation with instant feedback.
- Kickstart Free
- Free coding interview practice with Google engineers.
- OmegaUp Free
- Community-based competitive programming training platform that hosts the Mexican Olympiad in Informatics.
- Pramp Free
- Free peer-to-peer mock interviews for technical and behavioral questions.
- Rosetta Code Free
- Programming chrestomathy site with hundreds of tasks solved in many languages for comparative practice.
- Sanfoundry Free
- Thousands of MCQs, programming questions, and technical interview resources.
- Sphere Online Judge Free
- Large collection of algorithmic problems with community solutions.
- The Python Challenge Free
- Series of puzzles requiring Python code to advance to the next level blending math and programming.
- Timus Online Judge Free
- Russia's largest archive of programming problems with automatic judging from Ural Federal University contests.
- TopCoder Free
- Competitive programming arena and software development challenges.
- Virtual Judge Free
- Platform that lets users create virtual contests by aggregating problems from many notable online judges.