Taskcoach - Todo manager to keep track of personal tasks and todo lists

Task Coach is a simple open source todo manager to keep track of personal tasks and todo lists. It is designed for composite tasks, and also offers effort tracking, categories, notes and more. Tasks have a subject, description, priority, start date, due date, a completion date and an optional reminder. Tasks can recur on a daily, weekly or monthly basis. Tasks and notes can be assigned to user-defined categories.