Streaks - The to-do list that helps you form good habits.

Sleep Cycle - Bio-alarm clock that wakes you up at optimal times based on your sleep patterns.

Taskful - Deadlines, meet your match.

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.

ToDoList - Windows desktop application to stay on top of your daily tasks.

Talalarmo - Minimalistic android alarm