code playgrounds: jsbin, jsfiddle, codepen, glitch...

 Comparing Codepen, JSFiddle, JSBin, Glitch, Plunkr, CSSDeck, Liveweave, Dabblet | Cody Saylor

Trending - CodePen

JS Bin - Collaborative JavaScript Debugging

JSFiddle - Code Playground

Glitch: The friendly community where everyone builds the web

Which 'code playground' is the best, in your opinion: codepen.io, jsfiddle.net, jsbin.com, or something else? - Quora