From site: "Prana is an Inversion of Control (IoC) Container for ActionScript 3.0, and more specifically the Flex framework. It enables you to configure objects and components in a non-intrusive way by describing them in an external xml document and having them loaded at runtime."
An ActionScript framework for building Flash, Flex, and AIR apps that offers an Inversion of Control (IOC) container, a messaging framework, dynamic view wiring, localization, and other features.