The appearance of Rainlendar is its most distinctive feature, and movie fans often customize it using themed skins: Rainlendar

You can leverage Rainlendar’s standard features to manage a personal movie database or release schedule:

Advanced users can use Lua scripts to pull movie release data or cinema schedules directly from the internet into their calendar. Customizing the Look (Skins)

The built-in To-Do List is often used as a "Watch List" for movies you intend to see.