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>
Images by Pixel Mixer – www.pixel-mixer.com

Live username availability checking

A plugin for live username availability checking.

Innate Images LLC

An availability calendar for vacation rentals driven via the iCal standard by any calendar that exports iCal format (HomeAway, VRBO, Flipkey, AirBnB, Google, Apple iCloud, and more). 
Now Supports English, Spanish, or French langauges and date formats – built right in! Want your language added, just ask! 
The availability calendar shows the next 36 months of availability. Shortcodes enable you to display your calendar on any page or post in three different sizes. Arrive and depart dates 
from your master calendar are displayed as available and unavailable nights. The depart day is not counted as an unavailable night. 
Sync from your sources Daily, Twice Daily, or Hourly and modify the color options to fit your site’s look and feel perfectly.’

VR Calendar

An availability calendar for vacation rentals driven from any calendar that exports iCal (HomeAway, VRBO, Flipkey, AirBnB etc.).

Live username availability checking vs VR Calendar