Google Calendar - Spend less time managing your day & more time enjoying it
Gone - An ephemeral to-do list
CalenGoo - Features | 1.0.175 for Android™
Streaks - The to-do list that helps you form good habits.
Annual View - Annual View displays and manages calendar events within a year view.
Todoist - Todoist is a to-do list that helps you get organized, at work and in life.