JSitor - Test your NodeJS, JavaScript, CSS, HTML online with JSitor code editor.
Coastline - Simple minimalist text editor. Create, open, edit and save plain text files.
JS Bin - Sample of the bin:
Jota Text Editor - Jota, pronouced as "i-o-ta", is a text editor designed for a long text file.
CodePen - A front end web development playground.
Evernote - Bring your life's work together in one digital workspace. Evernote is the place to collect inspirational ideas, write meaningful words, and move your important projects forward.