Steve

The Availability Plugin displays booking availability on a year by year basis.
A full calendar year is displayed, with booked dates highlighted.
It is possible for mulitiple calendars to be created using a single install of this plugin.

Availability Calendar

A simple to use and manage availability calendar.

eGwada

The Openbookings Calendar Plugin displays booking availability of an object defined in your openbookings.org system.
A full calendar year is displayed, with booked dates highlighted starting from now.
You need to have installed openbookings.org on the same database as WordPress (see http://openbookings.org © for details

Openbookings Calendar Plugin

The Openbookings Calendar Plugin displays booking availability of an object defined in your openbookings.org system.

Availability Calendar vs Openbookings Calendar Plugin