Microsoft To-Do - Task management tool
Todoist - Todoist is a to-do list that helps you get organized, at work and in life.
Do by InVision - The world's most versatile to-do app UI kit for PS & Sketch
doo - A smart, simple app for reminders and to-dos
TickTick - TickTickis a cross-platform to-do list app & task manager helps you to get all things done and make life well organized.
Taskful - Deadlines, meet your match.