exercism is described as 'Download and solve practice problems in over 30 different languages. For code newbies and experienced programmers' and is a Code Learning Service in the Development category. There are more than 25 alternatives to exercism for a variety of platforms, including Online / Web-based, Android, iPhone, SaaS and iPad. The best alternative is freeCodeCamp, which is both free and Open Source. Other great apps like exercism are Codecademy (Freemium), SoloLearn (Freemium), W3Schools (Free) and tutorialspoint (Free).
Code.org is a non-profit whose goal is to expose all students to computer programming. We believe that computer programming is a liberal art; it's something EVERY student in the world should be exposed to at some point in their childhood education.
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 effective way to learn a programming language is to break the process into three phases:
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.