exercism

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

Free Open Source Web Terminal

25 Like

HackerRank

Engaging social network tasking developers with real world coding challenges and connecting them with great companies.

Free Personal Web

24 Like

Codewars

Achieve code mastery through challenge. Improve your skills by training with others on real code challenges Kata In our dojo, kata are real code challenges...

Freemium $ $ $ Web

17 Like

Project Euler

Project Euler is a series of challenging mathematical/computer programming problems that will require more than just mathematical insights to solve.

• There is a mathematical focus and has good examples of why some problems need optimized algorithms. You get exposed to a lot of cool math concepts and are challenged to write in efficient time and space complexity. Guest • Dec 2019 Disagree   Agree

Free Web

20 Like

CodinGame

CodinGame is a challenge-based training platform for programmers where you can play with the hottest programming topics.

Free Web

28 Like

CheckIO

CheckiO is expanding the world’s code literacy through gameplay. We always wanted to create the most entertaining game where gaming and coding experiences are...

Free Open Source Web Pycharm WebStorm

12 Like

Coderbyte

Coderbyte is a place built for anyone to practice and perfect their programming skills. Challenges are added almost every day so you can work on applying your...

Freemium Web

18 Like

Edabit

When learning to code, most people get stuck on the "bridge" between memorizing syntax and understanding the logic that makes it all work. We believe the most...

Commercial $ $ $ Web

56 Like

CodeSignal

CodeSignal is the leading provider of assessments for technical hires. As the creator of the Predictive Coding Score, a measure of a candidates coding skills, CodeSignal...

Commercial Web

13 Like

BitDegree

The world's first blockchain-powered online education platform with token scholarships & tech talent acquisition.

Freemium $ $ $ Open Source Web Self-Hosted

8 Like

Screeps

Learn to code JavaScript by playing game. This game claims to be the world’s first MMO strategy sandbox game for programmers.

Commercial $ $ $ Mac Windows Linux Web SteamOS

4 Like

Spoj

Sphere Online Judge created for the coders' community to train, to learn and to make progress. With thousands of programming problems and an international group of...

Free Web Self-Hosted

14 Like

The AI Games

Develop your coding skills and practice them by competing with hundreds of players worldwide. Code your own bots in your preferred language and join the various...

Free Web

7 Like

Codility.com

Codility is an evidence-based platform helps hiring teams predict the real-life skills of their candidates, remotely and at scale. This brings faster hiring, time...

Commercial Mac Windows Web Software as a Service (SaaS)

15 Like

Topcoder

Topcoder provides members opportunities to demonstrate their expertise, improve their skills, and win cash, while helping real world organizations solve real world...

Free Web

5 Like