Sprite Decomposer
A Github hosted fork of this upstream project, originally developed by Nicolas Smeets.
This project has been ported to use QT5, requiring minor source modification. The original project seemingly does not run on OS X 10.9.x (Mavericks), and I assume it will fail to run on 10.10.x (Yosemite) as well. This fork is intended to provide a working version for Mavericks. It has not been tested on Yosemite.
Feel free to file issues for problems you may come accross, or submit a PR.
Downloads
Pre-built app packages available on Sourceforge
License
This software has been licensed under a Creative Commons Attribution-NonCommercial-ShareAlike 3.0 Unported License