We developed Sprite Master for automatically generation sprite sheets for game developers (also web developers). You can take a look at our web site for more information.
Sprite Master, helps you to generate sprite sheets for your game using advanced algorithms and always tries to generate smallest sprite sheet. Also exports your sprite sheet coordinate data for the following platforms
* XML (Generic sprite data in XML format)
* JSON (Generic sprite data in JSON format)
* CSS (CSS Definition for use in Web pages)
* Cocos2D .plist file format Cocos2D game engine
* CoronaSDK .lua file for Corona game engine
* Sparrow .xml file for Sparrow game engine
* LibGDX .txt file format
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Take care.