Sleep Cycle - Bio-alarm clock that wakes you up at optimal times based on your sleep patterns.
Streaks - The to-do list that helps you form good habits.
Sleep as Android - Common alarm clocks ignore your sleep cycles, they wake you on schedule no matter your are currently in your deep sleep. Waking up from deep sleep is unpleasant, it makes you tired and it may negatively affect your productivity during the whole day.
Taskful - Deadlines, meet your match.
Pillow for iOS - An iOS companion that helps you sleep better 💤
Todoist - Todoist is a to-do list that helps you get organized, at work and in life.