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AtCoder is a programming contest site for anyone from beginners to experts. We hold weekly programming contests online.

Free practice programming interview questions. Interview Cake helps you prep for interviews to land offers at companies like Google and Facebook.

Learn programming with a multiplayer live coding strategy game for beginners. Learn Python or JavaScript as you defeat ogres, solve mazes, and level up. Open source HTML5 game!

Powerful coding training system. LintCode has the most interview problems covering Google, Facebook, Linkedin, Amazon, Microsoft and so on. We provide Chinese and English versions for coders around the world.

Learn and Practice on almost all coding interview questions asked historically and get referred to the best tech companies

Level up your coding skills and quickly land a job. This is the best place to expand your knowledge and get prepared for your next interview.

A website dedicated to the fascinating world of mathematics and programming

CodeSignal is the leading technical interview solution, helping talent acquisition and engineering teams #GoBeyondResumes to hire high-quality and diverse technical talent. Use CodeSignal's skills evaluation frameworks to tap into underrepresented pools of candidates, save valuable engineering resources, increase speed-to-hire, and increase candidate pipeline yield.

Learn, practice and get world-class mentoring in over 50 languages. 100% free.

Coding practice for all programming levels – Join a community of over 3 million developers and improve your coding skills in over 55 programming languages!

HackerEarth is a global hub of 5M+ developers. We help companies accurately assess, interview, and hire top tech talent.

SPOJ (Sphere Online Judge) is an online judge system with over 315,000 registered users and over 20000 problems. The solution to problems can be submitted in over 60 languages including C, C++, Java, Python, C#, Go, Haskell, Ocaml, and F#. SPOJ has a rapidly growing problem set/tasks available for practice 24 hours/day, including many original tasks prepared by the community of expert problem setters associated with the project.

HackerRank is the market-leading technical assessment and remote interview solution for hiring developers. Learn how to hire technical talent from anywhere!

CSAcademy is a next generation educational platform. Discover computer science with interactive lessons and a seamless online code editor.

CodinGame is a challenge-based training platform for programmers where you can improve your coding skills with fun exercises (25+ languages supported)

Improve your coding skills with our library of 300+ challenges and prepare for coding interviews with content from leading technology companies.

Codeforces. Programming competitions and contests, programming community

Programming, Web Development, and DevOps news, tutorials and tools for beginners to experts. Hundreds of free publications, over 1M members, totally free.

Stack Overflow | The World’s Largest Online Community for Developers

A Computer Science portal for geeks. It contains well written, well thought and well explained computer science and programming articles, quizzes and practice/competitive programming/company interview Questions.

Browse thousands of programming tutorials written by experts. Learn Web Development, Data Science, DevOps, Security, and get developer career advice.

by Radu Raicea How open source licenses work and how to add them to your projects Image credit: GitHubRecently, there was some exciting news for developers around the world. Facebook changed the license of multiple libraries they develop. They switched from BSD-3+patents to a MIT. That seems good, but what

Lookup open source licenses summarized & explained in plain English.

Replit is a simple yet powerful online IDE, Editor, Compiler, Interpreter, and REPL. Code, compile, run, and host in 50+ programming languages.

Search Interactive Mind Maps to learn anything

2271 Free SVG icons for popular brands.