Remember The Milk - Remember The Milk is a task and time management application for mobile devices.
TakeNote - A web-based note-taking app with GitHub sync and Markdown support.
Notepad Checklist - A checklist made by notepad.pw, easy short and fun to use.
PlicPad - Shareable notepad without urls
Todoist - Todoist is a to-do list that helps you get organized, at work and in life.
NoteAway - NoteAway is the simplest, most convenient way to take quick notes on OS X.