Google Calendar - Spend less time managing your day & more time enjoying it
Nirow - Habit tracking: Automated, Siri-ed, Calendar-ed, and More!
Simple Calendar - A simple calendar with events (optional recurring and reminders), week numbers and a customizable...
Gone - An ephemeral to-do list
Lightning Calendar - Organize your life — it’s about time!
Taskful - Deadlines, meet your match.