This module provides a basic block that will let you tell others if you are available for work. You can change the block title and the phrasing that appears from the block configuration page.
Occasionally, you need to show a client several different color options for a page or highlight a particular element in a layout for a customer, but you don't want any other users to see those changes. This module allows you to do all of that and more, by modifying css based on a URL.