OneNote - Get the OneNote app for free on your tablet, phone, and computer, so you can capture your ideas and to-do lists in one place wherever you are. Or try OneNote with Office for free.

WriteXO - A cloud based notepad made for writers by writers.

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.

notepad.pw - notepad.pw is a online notepad which allows you to save your text in the cloud with features like

MindForger - Thinking notebook and Markdown IDE web site home page

Edit Pad - Fast, web-based plain text editor for quickly taking notes online.