Calendar Tasks

A list of tasks created from calendar events. The tasks are sorted according
to their priority. They are colored according to their state: finished tasks
are grayed out (or optionally omitted from the list), future tasks are not
colored, started tasks are green, tasks that are due today are yellow, and
tasks with expired due date are red. The tasks can be edited, marked as done,
deleted. The task list cooperates with standard calendar applications. Any
number of calendars can be joined to a single task list.