JSitor - Test your NodeJS, JavaScript, CSS, HTML online with JSitor code editor.
Nebulous Notes - Nebulous Notes is a powerful, yet simple, text editor for note-takers, writers, and coders.
JS Bin - Sample of the bin:
DroidEdit - DroidEdit is a text and code editor for android tablets and phones with the following features:
CodePen - A front end web development playground.
TextDrop - TextDrop is the fastest way to edit text files in your Dropbox using a web browser.