doo - A smart, simple app for reminders and to-dos
Nirow - Habit tracking: Automated, Siri-ed, Calendar-ed, and More!
Gone - An ephemeral to-do list
Things - Things is an easy to use task manager.
Taskful - Deadlines, meet your match.
Taskade - Make lists, organize your thoughts, and be inspired to get things done. Taskade is a collaborative space for your tasks.