From Tama Software:
Pepakura Viewer is a Free Dedicated Viewer that shows works created by Pepakura Designer. n Pepakura Viewer, there are many features to help you show and print developments and construct paper crafts. You can see finished images easily, because paper crafts are shown as 3D models on the screen, check how to construct paper crafts, because you can highlight cutting positions and check the correspondence of development to the 3D model on the screen, check paste positions, because corresponding edge numbers are shown on the screen, configure the Viewer to switch or hide textures. You can create models of original patterns or white models.