Coastline - Simple minimalist text editor. Create, open, edit and save plain text files.
Google Keep - Capture notes, share them with others, and access them from your computer, phone or tablet. Free with a Google account.
Jota Text Editor - Jota, pronouced as "i-o-ta", is a text editor designed for a long text file.
TextDrop - TextDrop is the fastest way to edit text files in your Dropbox using a web browser.
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.
JS Bin - Sample of the bin: