Pepakura Viewer is a free application to show images in 3D and the origami patterns that have been created with another tool from the same author: Pepakura Designer
Pepakura Viewer offers useful options to show and print virtual artistic creations onto paper. For example: you can easily find the images because it shows them on-screen, in 3D. You can learn how to build these images, stick fragments together, configure the program to change or hide textures, create models from original patterns, etc.