TexturePacker

https://www.codeandweb.com/texturepacker


TexturePacker is a GUI and command line tool to create sprite sheets or sprite atlases. Without specifying any additional options it creates very good results, and offers enough additional options to adjust things to your needs.

The tool supports OS X, Windows and Linux (Ubuntu), and provides a range of features such as one-click export for all devices, multi-packing, asset protection and exports for several gaming frameworks like Cocos2d, Unity, Marmalade, Unreal Engine, etc. TexturePacker integrates our PowerVR texture library, PVRTexLib.

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