This app allows you to simulate how any origami crease pattern will fold. It may look a little different from what you typically think of as "origami" - rather than folding paper in a set of sequential steps, this simulation attempts to fold every crease simultaneously.
As a physical product designer who invented the first ever folded wallet made of a single sheet of Tyvek I'm loving the potential this has to help visualize new prototypes before going into production. Great tool!