Of all the apps that students have shared with me over the years, Foldify is probably my favorite. A few years ago one of my my students used it to design a bunch of characters and buildings that he then printed, colored, and folded according to the Foldify print-out. He then used those characters in a video that he made. In his video he and other students provided the voices for each character.
Last year Foldify introduced Foldify Zoo for designing and printing animals. This spring Foldify released Foldify Dinosaurs for designing, printing, and constructing dinosaur models.