Awesome

AS3 2D GPU accelerated engine, easy to use. Discontinued

When you want to generate sprite sheets using Adobe Flash CS6, follow these instructions:

1. Save JSON-Nexus.plugin.jsfl from the root folder of the github repo to Program Files\Adobe\Adobe Flash CS6\Common\Configuration\Sprite Sheet Plugins.
2. Now open Flash CS6, select the files you want to save as a sprite sheet in your library, press right mouse and click on Generate Sprite Sheet....
3. Click on the Data format: menu and select JSON-Fixed, and dont select Rotate, you can select Trim and Stack Frames if you like. The engine uses alpha maps so I would recommend using PNG's without a background color, I also recommend a Shape padding of about 10 pixels when you want to generate normal maps.
4. Press on Browse and select the location where the source files of your project are, press Save and then press Export.

Example Code:

var world:SimpleWorld = new SimpleWorld(stage, spriteSheet, spritesPosition, normalMap);
/* 
*  Creates a new World instance, this initializes the GPU for rendering
*  The first variable is the stage so it can get the size of the stage and the framerate
*  The second variable is the sprite sheet texture map, this map contains all the objects you want to draw
*  The third variable is a string containing the positions passed by the JSON script used to create the sprite sheet
*  The last variable is optional, it is a normal map which you can generate using the sprite sheet map
*/

DebugSpriteSheet.saveAsPnG(spriteSheet, spritesPosition, 2048, 2048);
/*
*  Optional, this saves a image to your computer where each sprite is labelled with the sprite id that must be used to call on it
*  This is very usefull for debugging so you dont have to remember all the id's
*  The first variable is the sprite sheet you want to disect
*  The second variable is the JSON string used for the sprites positions
*  The third and fourth variables are the size of the image you want to saveAsPnG
*/

var object:Box = world.addSprite(spriteId, Box);
/*
*  This creates a sprite which is pooled automatically, you can destroy it by using object.die()
*  The first variable is the id of the sprite, you can find this using the DebugSpriteSheet function
*  The second variable is the type of the object, you can use StaticBox (No scale and rotation), Box, and MovieBox(Animated using multiple sprites)
*/

// Inside a enterFrame Event listener:
world.render(new Point(lightPositionX, lightPositionY));
/*
*  This function renders the stage, when you supplied a normal map with the constructor function it uses 3 render passes, and otherwise 1
*  The variable that is passes is the position of the light used with the normal map as a Point
*/