Coastline - Simple minimalist text editor. Create, open, edit and save plain text files.
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.
OneNote - Get the OneNote app for free on your tablet, phone, and computer, so you can capture your ideas and to-do lists in one place wherever you are. Or try OneNote with Office for free.
JS Bin - Sample of the bin:
TextDrop - TextDrop is the fastest way to edit text files in your Dropbox using a web browser.
Codeanywhere - Codeanywhere is a complete toolset for web development. Enabling you to edit, collaborate and run your projects from any device.