QR Droid - QR Droid Zapper
Scanova.io - QR code generator, designer, and campaign management tool.
Barcode & QR Code Scanner - A free app which allow to read and generate barcodes for Android.
VisualCode - QR codes for everything
QuickMark - QuickMark makes everything possible.
Kinoni Barcode Reader - Use your iPhone as a professional barcode scanner for your PC or Mac.