[Origami] Origami Software?

[Hernandez Family]

    Does anyone know of any type of software that allows you to virtually fold 
a sheet of paper?  I've spent hours searching for one, but I never found what I 
was looking for.  With the technology that we have today, it certainly seems 
possible.  In fact, I even found an origami game online called "folds," but it 
does not allow anything more than valley folds.  So, again, if anyone knows of 
such a software , please let me know. Thank You,Devon H. (Also, it would 
preferably need to run on Windows 7.)