SpritePlane is a great plugin for Photoshop to convert .GIF files into sprite sheets with just a few clicks!
It converts GIFs like 
to 
You can find all the information, instructions and download link on the SpritePlane GitHub page.
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Visual Story is a storytelling/film class 2011. Team Promo and Retrofit assignment.
Entertainment Technology Center, Carnegie Mellon
Also, check out spritestoolbox.com. The design isn’t great, but it works better than all the other online tools