QR Codes

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https://itunes.apple.com/us/app/qr-code-maker/id513617634?mt=8 Description QR Code Maker is an application that is used to create those rectangle codes that you scan with your mobile device - QR codes. This application will create codes for you and than save it for your photo library so you could use it!

QR Code Maker for iPhone 3GS, iPhone 4, iPhone 4S, iPhone 5, iPod touch (3rd generation), iPod touch (4th generation), iPod touch (5th generation) and iPad on the iTunes App Store

QRreader: Desktop QR Code Scanner

http://dansl.net/qrreader/ Desktop QR Code Scanner. About QRreader: QRreader is a Desktop application for scanning/reading QR Codes using your computer's webcam. How to use QRreader: 1: Make sure you have a working webcam and Adobe AIR installed. 2: Download and install QRreader. 3: Get a scan-able QR code (generated on a device, or printed) 4: Hold up the QR code to your webcam.
QR Codes (Quick Response Codes) are just barcodes. There is nothing fancy about them. Just like the grocery store clerk uses barcodes to look up the product and scan the price into the computer, your mobile device or computer can look up QR codes to: take you to a website, read some text, give you a phone number, or generate a text message. http://coolcatteacher.blogspot.com/2011/05/qr-code-classroom-implementation-guide.html

QR Code Classroom Implementation Guide