TaskRegistry is a calendar, open tasks and time registation program.
The calendar is inspired by a classic monthly "one page, one
column" calendar sheet. The time registration is designed to track the
time spent on projects, f.e. to write monthly invoices to your customers. And
on tasks you can simply note your open tasks, arrange them in groups and
prioritize them lower or higher.
Note that this software won't be usable on Windows or Apple operating systems!