Cristallight and Don Kurt have released iBarcoder 3.3.3 (http://www.cristallight.com/iBarcoder/), the latest Mac barcode software for Mac OS X 10.4 or later.
iBarcoder (US$39.95) supports multiple symbologies including the Japanpost customer Mac barcode, three types of FIM codes, Postnet, Several UPC, EAN and IBSN codes, QR code, and more. With the app you can individualize the coding to identify location sold, style, and other tracking information.
A Counter Mode automatically creates the next barcode in a sequence from the defined parameters you have specified. You can use starting numbers and postix parts using the increment value established.