Arthur Gay

This plugin allows user to know if his username is available while typing. No further need to hit the “submit” button to check username availability. Each times the user types a character in the username textfield, an ajax request is send to a php script which check username availability.
<h3>Credits</h3>
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Live username availability checking

A plugin for live username availability checking.

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.

Live username availability checking vs Availability Calendar