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Quip - Quip is the modern productivity suite that simplifies your life and helps your team get work done faster.
Chars - Unicode Symbols Keyboard for iOS
Google Docs - Create a new document and edit with others at the same time -- from your computer, phone or tablet. Get stuff done with or without an internet connection. Use Docs to edit Word files. Free from Google.
Falcon for iOS - Writing notes made simple
Trello - Infinitely flexible. Incredibly easy to use. Great mobile apps. It's free. Trello keeps track of everything, from the big picture to the minute details.
A5 - Takes notes in your browser. Elegant & simple.