Retinasizer lets you quickly drag and drop your @3x assets on to the status bar to create @2x and @1x assets automatically. All you need to do is drag and drop an @3x asset onto the Retinasizer status bar item and, consequently, the program will automatically generate @2x and 1x assets for your asset.
Icon Mask Maker (IMM) makes high definition Icon and transparent Mask to build Transparent Icons.
