Todoist - Todoist is a to-do list that helps you get organized, at work and in life.
doo - A smart, simple app for reminders and to-dos
Todoist 10 for iOS - A completely new Todoist for iOS
Simplenote - The simplest way to keep notes. Light, clean, and free. Simplenote is now available for iOS, Android, Mac, and the web.
Microsoft To-Do - Task management tool
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.