ZXing - Barcode Scanner for Android
DNSChecker.org QR Code Scanner - QR Scanner is the perfect tool to read QR codes with a webcam on a PC. It also allows you to upload the QR code image for scanning.
QuickMark - QuickMark makes everything possible.
Barcode2Win - Transform Android device into a Windows WiFi barcode scanner
QR Droid - QR Droid Zapper
ConnectUpz - Helping service businesses to connect and grow your customer base by becoming part of of a larger ecosystem.