CheckiO - coding games and programming challenges for beginner and advanced
CheckiO - coding websites and programming games. Improve your coding skills by solving coding challenges and exercises online with your friends in a fun way. Exchanges experience with other users online through fun coding activities
English Exercises - Learn English with ESL Activities
A collection of exercises for grammar, vocabulary, verbs, listening, reading, phonetic symbols and more. You can also access worksheets, audio stories, videos, and songs related to English.
ESL: English as a Second Language - Free English learning resources
A huge free online English learning resource, with over 2,500 conversations and 3,000 short stories, essays, with audio and exercises for listening, speaking, reading, and writing.
Screeps - MMO strategy sandbox game for programmers
A strategy sandbox MMO game with a persistent open world where you play by writing JavaScripts to control your units. They live within the game and operate autonomously even while you are offline!