2. SketchBook Pro As with many apps, you can try this one out, but it will cost you $50 at the App Store. It's mainly a way to create images, like what you'd use Adobe Illustrator for. There is a free version of this software in the Mac App Store and it's called Sketchbook Express.3. Aperture Since we've experienced issues with iPhoto, we prefer using Aperture. It costs $80 at the App Store and it's filled with features for people who want to do some post-processing with their photos, but don't want to use Photoshop. The App Store version is significantly cheaper as the one that you can buy in Apple stores, $80 vs $200.
4. GIMP For Mac This is an open-source freeware that will allow you to edit your images. There are many ways of using it, from a simple paint program to an expert quality photo retouching program. Since it's free, it's hard find reasons why you shouldn't give it a try.
5. Adobe Lightroom This is available for Windows and OS X and it's a strong tool to do image post-processing with. There are a lot of features that will allow you to play with your images easily, as well as a lot of set options, which means that you can use them on your photos without too steep a learning curve.