With the Spritesheet Cutter (also called Map Editor or Level Editor) you can cut/share/export/move/name single or multiple sprites using drag & drop. There is a copy mode so maps can be created. Sprites are numbered left to right/top to bottom or randomly. Sprites can be added to a sheet and saved as a whole. An animation preview is included. Spritesheet Cutter can create GIFs and XMLs.
Color selections can be converted to transparency.
PicPodz is on the Mac App Store (http://is.gd/iAEWHn)
PicPodz is an OS X 10.10 desktop photo slideshow in the form of a sphere. Just drag images into the window then change modes. Pics will change randomly. Resize or maximize to suit your needs.
I recommend organizing copies of pics into folders, rather than using originals. Just select all images and drop them into the window.