I use blender to pre-render my sprites. I let a camera rotate around the object and export it as an animation, This always generates a big pile of bitmaps. I used to use photoshop to copy/paste all the bitmaps in one big file to be used in my games. But i was kind of fed up by doing this manually with sprites which had a big number of animations. I searched the net for some decent programs, but i couldn't find any freeware tools that could simplify my work. So,I decided to write my own. Although, I have written it in a few houres, it functions decently. I want to let the community benefit from this tool. Does anyone know of any website that would be willing to place a link to my application? You can find my application here http://www.leondroog.com/spriteconcat