Date Reminder - Date Reminder reminds you of recurring or nonrecurring events, like birthdays, bills to pay...
Crontab UI - Easy and safe way to manage your crontab file
GoGetter - GoGetter is a task management system based on David Allen’s ever so popular Getting Things Done...
024h Lucky Reminder - 024h Lucky Reminder is a reminder software for home and office.
todoMini - Your web based TODO list.
Trello - Infinitely flexible. Incredibly easy to use. Great mobile apps. It's free. Trello keeps track of everything, from the big picture to the minute details.