TakeNote - A web-based note-taking app with GitHub sync and Markdown support.
WriteXO - A cloud based notepad made for writers by writers.
NoteAway - NoteAway is the simplest, most convenient way to take quick notes on OS X.
Edit Pad - Fast, web-based plain text editor for quickly taking notes online.
PlicPad - Shareable notepad without urls
EditPad Lite - EditPad Lite: A fine text editor with all the necessary basic features. Free for non-commercial use. An ideal replacement for Notepad.