Todoist - Todoist is a to-do list that helps you get organized, at work and in life.
Gone - An ephemeral to-do list
Gnome To Do - GNOME To Do is a simplistic personal task manager designed to perfectly fit the GNOME desktop.
Streaks - The to-do list that helps you form good habits.
mCheck - A checklist application written in java with reminders and system tray support to improve...
DejaOffice - Super-charged calendar, contacts, tasks and notes apps for Android, iPhone and iPad.