Todoist - Todoist is a to-do list that helps you get organized, at work and in life.
Todoist 10 for iOS - A completely new Todoist for iOS
TaskPaper - Plain text to-do lists for Mac
Procreate - Procreate is the most powerful and intuitive digital illustration App available for iPad®.
Listy Beta - The things you love, privately saved and beautifully listed
Microsoft To-Do - Task management tool