ZXing - Barcode Scanner for Android
Stocard - All loyalty cards on your smartphone!
QR Droid - QR Droid Zapper
Key Ring Reward Cards - Tired of all the loyalty cards dangling from your keys or stuffed in your wallet?
Barcode to PC: Wi-Fi scanner - Turn your smartphone into a real barcode scanner
CardStar - Leave those bulky plastic “reward cards” and “club cards” at home!