Microsoft To-Do - Task management tool
Todoist - Todoist is a to-do list that helps you get organized, at work and in life.
Gone - An ephemeral to-do list
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.
KosmoTime - The to do list with super powers
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.