Todoist - Todoist is a to-do list that helps you get organized, at work and in life.
Microsoft To-Do - Task management tool
Todo - Todo is a to-do and task list app.
Prodeus - Track your time learning on YouTube to earn your free degree
doo - A smart, simple app for reminders and to-dos
Thrive - Thrive is an intuitive tool to manage your business using the latest trends in Project Management, Dashboards, Customer Relationship Management & Accounting