REPL.IT
The world's leading online coding platform
Powerful and simple online compiler, IDE, interpreter, and REPL. Code, compile, and run code in 30+ programming languages: Clojure, Haskell, Kotlin (beta), QBasic, Forth, LOLCODE, BrainF, Emoticon, Bloop, Unlambda, JavaScript, CoffeeScript, Scheme, APL, Lua, Python 2.7, Ruby, Roy, PHP, Python, Nodej...