The i-Gobo app from Rosco allows users to compare, select, specify, and rotate gobos on Apple iPhone devices. Available free at the iTunes store, the application includes the entire Rosco range of more than 1,400 designs of standard steel and glass gobos, some of which were created by designers including Jules Fisher, Tony Walton, David Hersey, and Abigail Rosen Holmes. The app also includes all former DHA standard gobos. 
www.rosco.com