hackattic - No nonsense, real world programming challenges
Code-Free Startup - Learn how to build real apps without coding
Frontloops - Level up your frontend skills with handcrafted tasks
Code4Startup - Learn Ruby on Rails, Python, AngularJS, NodeJS, React, Ionic by cloning AirBnb , TaskRabbit, Tinder, Product Hunt, Fiverr and . more.
Daily Coding Problem - Get exceptionally good at coding interviews
Codeplace - Learn how to code by building real web apps