QuickMark - QuickMark makes everything possible.
UpKeep - Upkeep is proven to expedite workflow processes. Keep track of everything you do on a day to day basis with UpKeep!
Barcode & QR Code Scanner - A free app which allow to read and generate barcodes for Android.
BarCodeWiz OnLabel - Barcode and QR Code and Barcode
ZXing - Barcode Scanner for Android
Manatee Works - Manatee Works offers barcode decoding solutions.