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.
Jota Text Editor - Jota, pronouced as "i-o-ta", is a text editor designed for a long text file.
Joplin - Joplin is a free, open source note taking and to-do application, which can handle a large number of notes organised into notebooks. The notes are searchable, tagged and modified either from the applications directly or from your own text editor.
Google Keep - Capture notes, share them with others, and access them from your computer, phone or tablet. Free with a Google account.
JS Bin - Sample of the bin: