Barcode Box - Records a list of barcodes when you scan them and reminds you if you've seen it before.
ZXing - Barcode Scanner for Android
JD Sports - JD Sports is a free shopping platform that design for those who want to buy sports products like trainers, apparel, equipment, and accessories.
QuickMark - QuickMark makes everything possible.
QR Droid - QR Droid Zapper
ScanLife - The ScanLife mobile application converts a typical camera phone into a universal barcode reader.