Apps and web tools for QR codes.
Paid iPad app: https://itunes.apple.com/us/app/scan/id411206394?mt=8&uo=4&at=10l6SU
Paid iPhone app: https://itunes.apple.com/us/app/scan/id411206394?mt=8&uo=4&at=10l6SU
Free Android Phone app: https://play.google.com/store/apps/details?id=me.scan.android.scan
Paid Mac program: https://itunes.apple.com/us/app/scan-qr-code-barcode-reader/id722364523?mt=12
Website: http://www.classtools.net/QR/
Free Android Phone app: https://play.google.com/store/apps/details?id=de.gavitec.android
Free iPad app: http://itunes.apple.com/us/app/neoreader-qr-reader-barcode/id284973754?mt=8&uo=4&at=10l6SU
Free iPhone app: http://itunes.apple.com/us/app/neoreader-qr-reader-barcode/id284973754?mt=8&uo=4&at=10l6SU
Free iPad app: https://itunes.apple.com/us/app/qr-reader-for-ipad/id426170776?mt=8&uo=4&at=10l6SU
Website: http://goo.gl/