Online

try online coding that will be our future ;)

https://try.ocamlpro.com/
https://codility.com/programmers/challenges/
http://www.eclipse.org/che/

Puzzle

http://www.puzzle-maker.com

java / one of the famous object orinted programming languages
graal / dynamic compiler of Java
jvm / stands for Java virtual machine 
mapreduce / base algorithm of stream library in Java