Caret Editor - Caret Editor is an editing tool for Chrome OS that is used for editing texts or codes.
CodePen - A front end web development playground.
Xed - A text editor forked from Pluma and Gedit. Xed is the default text editor of Linux Mint.
JSFiddle - Test your JavaScript, CSS, HTML or CoffeeScript online with JSFiddle code editor.
Nova Code Editor - Nova Code Editor is software that is used for writing and editing codes.
JS Bin - Sample of the bin: