Stop logging out of the game just to change your addons!
ACP adds the "Addons" button to the game's main menu (The one you get when you hit ESC). It allows you to manage your addons in game, with an interface which looks similar to the blizzard addon manager. ACP will help you deal with the "Clutter" that multi-part addons and libraries introduce by displaying your addons in logical arrangements. ACP has many features to make your addon list easy to manage, help you with missing libraries, and provide you with detailed information about each addon.