Scan USPS barcode from a Mac Is there any App that permits scanning barcodes?  An app that also supports UPS and Fedex would be useful.

The following search did not bring up any obvious results.  http://alternativeto.net/software/scan--qr-code-reader-/?platform=mac
You can scan barcodes on the Mac with Delicious Library (available for free from https://delicious-monster.com/). You can use it to scan in the barcodes of your CD / DVD collection, but I don't know if it will read the barcode formats used by USPS/FedEx/UPS.