This is a standard WordPress install with Tina MVC plugin installed. The Tina MVC custom login/registration/reminder functions are in use.

WTF is Tina-MVC?

Tina MVC is a framework for developing your own WordPress plugins, widgets and shortcodes.

For more information on Tina MVC, go to SeeIT.org or to the Tina MVC page in the WordPress plugins directory.