Exist - Track everything in one place, understand your life.
Todoist - Todoist is a to-do list that helps you get organized, at work and in life.
Quantimodo - Easily track mood, symptoms, or any outcome you want to optimize
Prodeus - Track your time learning on YouTube to earn your free degree
Zenobase - Zenobase helps store and visualize data.
Todo - Todo is a to-do and task list app.