Todoist - Todoist is a to-do list that helps you get organized, at work and in life.

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.

doo - A smart, simple app for reminders and to-dos

Simplenote - The simplest way to keep notes. Light, clean, and free. Simplenote is now available for iOS, Android, Mac, and the web.

Laverna - Laverna is a JavaScript note taking application with Markdown editor and encryption support.

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.