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.
TakeNote - A web-based note-taking app with GitHub sync and Markdown support.
MyPost - A quick, user-friendly single webpage creation platform without having to deal with hosting or...
NoteAway - NoteAway is the simplest, most convenient way to take quick notes on OS X.
Jotflow - Jotflow is a markdown based platform for broadcasting your ideas and voicing your opinions.
PlicPad - Shareable notepad without urls