repl.it : Powerful and simple online compiler, IDE, interpreter, and REPL. Code, compile, and run code in 30+ programming languages. including JavaScript, Pytho...
ideone.com : Ideone is an online compiler and debugging tool which allows youto compile source code and execute it online in more than 60 programming languages.
Glicol : make music with code. connect different nodes like a synth, sequencer or sampler.
Carbon : Create and share beautiful images of your source code.
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