FlxAnim Just a helper structure for the FlxSprite animation system.
 FlxDebugger Container for the new debugger overlay.
 FlxList A miniature linked list class.
 FlxPreloader This class handles the 8-bit style preloader.
 FlxQuadTree A fairly generic quad tree structure for rapid overlap checks.
 FlxReplay The replay object both records and replays game recordings, as well as handle saving and loading replays to and from files.
 FlxTile A simple helper object for FlxTilemap that helps expand collision opportunities and control.
 FlxTilemapBuffer A helper object to keep tilemap drawing performance decent across the new multi-camera system.
 FlxWindow A generic, Flash-based window class, created for use in FlxDebugger.