1. Topcoder
Topcoder is a crowdsourcing company with an open global community of designers, developers, data scientists, and competitive programmers. Topcoder pays community members for their work on the projects and sells community services to corporate, mid-size, and small-business clients.
2. CodeChef
CodeChef is a competitive programming website Online. It is a non-profit educational initiative of Unacademy, aimed at providing a platform for students, young software professionals to practice, hone their programming skills through online contests Apart from this, the 'CodeChef For Schools' program aims to reach out to young students and inculcate a culture of programming in Indian schools.
3. Coderbyte Enterprise
Improve your coding skills with our library of 300+ challenges and prepare for coding interviews with content from leading technology companies.
4. Codewars
Codewars is an educational community for computer programming. On the platform, software developers trained on programming challenges known as kata. These discrete programming exercises train a range of skills in a variety of programming languages and are completed within an online integrated development environment.
Codeforces is a website that hosts competitive programming contests. It is maintained by a group of competitive programmers from ITMO University led by Mikhail Mirzayanov. Since 2013, Codeforces claims to surpass Topcoder in terms of active contestants. As of 2018, it has over 600,000 registered users.
6. Project Euler
Project Euler is a website dedicated to a series of computational problems intended to be solved with computer programs. The project attracts adults and students interested in mathematics and computer programming. Since its creation in 2001 by Colin Hughes, Project Euler has gained notability and popularity worldwide.
7. HackerRank
HackerRank is a tech company that focuses on competitive programming challenges for both consumers and businesses, where developers compete by trying to program according to provided specifications.
8. SPOJ
SPOJ is an online judge system with over 640,000 registered users and over 20,000 problems. Tasks are prepared by its community of problem setters or are taken from previous programming contests.
9. CodinGame
CodinGame is a technology company editing an online platform for developers, allowing them to play with programming with increasingly difficult puzzles, to learn to code better with online programming Contests.
10. Exercism
Exercism is an online, open-source, free coding platform that offers code practice and mentorship on 50 different programming languages.
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