Photobie is a completely free application better than many others that are expensive and not as efficient as this one. When it comes to image processors, this is one of the bests you will be able to find in the market. It has several useful features to edit your photographs, print them or create slide shows.
It easy to use and understand, it's really light so it won't bother you with system resources while working with it or crash your computer in the middle of an editing session.
With this application you will become an expert modifying your digital pictures and giving the coolest visual effects to them.