Originaly this tool was created to help people to create sprites for DS Games. But you can use it to make much more. The features is: Select a list of image files to join them on one single image. Hope you enjoy! And donate if possible!
Result with Vertical Orientation and TopLeft alignment
8x8 + 16x16 + 32x32 + 64x64 in Vert / MiddleRight
Some selected files and orientation and alignment open