Rosetta Code
Rosetta Code is a programming resource that provides example problems of how to write the same functionality in different programming languages, to aid in the process of learning new programming languages.
Codingbat
The online programming practice in java and python. CodingBat is a free site of live coding problems to build coding skill in ...
CodinGame
CodinGame is a challenge-based training platform for programmers where you can play with the hottest programming topics.
SoloLearn
SoloLearn offers tools for learning to code across multiple languages, available across web and multiple mobile platforms. The ...