Todoist - Todoist is a to-do list that helps you get organized, at work and in life.
Todo - Todo is a to-do and task list app.
Do by InVision - The world's most versatile to-do app UI kit for PS & Sketch
Prodeus - Track your time learning on YouTube to earn your free degree
TickTick - TickTickis a cross-platform to-do list app & task manager helps you to get all things done and make life well organized.
Worklog - Track tasks in your browser with your favorite time tracker