Applicons

Applicons is an utility that allow you generate all the icons/iconset needed for OS X and iOS development (Mac, iPhone, and iPad).

Effect: "rounded corners" and "drop shadow". Create the .icns file. The image is resized (1024 px at 72 dpi) if it's too large/small. Export your icon as PNG/TIFF/JPEG/JP2/BMP/GIF file format; Save your template on iCloud.