ZXing - Barcode Scanner for Android
Stocard - All loyalty cards on your smartphone!
QR Droid - QR Droid Zapper
PayPal - PayPal is the faster, safer way to pay online without sharing financial details, send and receive money or accept credit and debit cards as a seller
Barcode to PC: Wi-Fi scanner - Turn your smartphone into a real barcode scanner
Pass2U Wallet - Put cards into Apple Wallet