This is a paid to distribute plugin for Joomla! 2.5.x and Joomla 3.0.x that allows you to reserve usernames so that no one can register using a reserved username.
This is the official website of Ultania, maker of extensions (components, modules, and plugins) for Joomla!™
Ultania has released the Ultania PDF Certificate maker. When used with Joomla!™, Ultania PDF Certificate Maker will allow you to create dynamic one-page PDF certificates or other PDF documents on the fly. The PDF certificate or PDF document can include dyamic information such as a score, the date, and the name or username of the logged in Joomla! user.