Ghostnote - Add notes to anything.
Evernote - Bring your life's work together in one digital workspace. Evernote is the place to collect inspirational ideas, write meaningful words, and move your important projects forward.
Box Notes - Box Notes: take meeting notes, share status updates and plan projects together instantly. Online, across devices.
Workflowy - A better way to organize your mind.
Dropbox Paper - A collaborative document-editing service
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.