I just love. It's easy to use and share
Remember The Milk - Remember The Milk is a task and time management application for mobile devices.
OnlineNotepad.org - Free browser-based text editor
Notepad Checklist - A checklist made by notepad.pw, easy short and fun to use.
Shrib - Take notes online. 'Free and no login' or 'AI assistant, visitor stats, privacy and productivity': super simple, with publishing and markdown, share to all devices.
Todoist - Todoist is a to-do list that helps you get organized, at work and in life.
HTML-Notepad - HTML WYSIWYG editor for structured documents