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.