This plugin displays a booking / availability calendar on you WordPress website.
The calendar is designed for vacation home owners. It displays available periods, unavailable periods (booked), pending inquiries.
It is also possible to display in the calendar pricing season information (very high, high, medium, low season).
The calendar is hosted on shared-house.com website. It requires to sign-up (for free) on this website, but can be tested without an account.
More info on this page: http://www.shared-house.com/free-booking-calendar.php