Date Reminder - Date Reminder reminds you of recurring or nonrecurring events, like birthdays, bills to pay...
Reminduck - A simple reminder app made for elementaryOS with Vala and GTK. - matfantinel/reminduck
GoGetter - GoGetter is a task management system based on David Allen’s ever so popular Getting Things Done...
Reminder Commander - Reminder manager that reminds you about important events in advance.
todoMini - Your web based TODO list.
Digital Clock 4 - Beautiful customizable clock with plugins