Enlista Calendar is an easy to use program that allows users to create and share calendars and appointments with other users over the internet without the need of centralized infrastructure. It runs on Windows, Linux and MacOSX. It lets users create multiple calendars (Personal, Business, Family, etc.) and share each calendar with a different group of people. Users with multiple calendars can Overlay multiple calendars in the same view to gain a complete picture at a month's schedule.