As described by Lifehacker.com: "Mangle is a handy tool for formatting your Manga and comic collections for easy reading on your Kindle. It includes page sorting, downsampling, and auto rotation for fuss-free reading."
Seashore is an open source image editor for Mac OS X's Cocoa framework. It features gradients, textures and anti-aliasing for both text and brush strokes. It supports multiple layers and alpha channel editing. It is based around the GIMP's technology and uses the same native file format.
With DrawBerry, you have all the possibilities the vectorial drawing offers you in a free, easy to use and powerful application. If you don't need applications such Illustrator or Inkscape and you want to create some simple (or less simple) illustrations, DrawBerry is for you.