Barcode Scanner (988 KB), a small yet efficient tool by ZXing Team to scan data matrix and
QR codes containing URLs, contacts, products info, etc. If you've not installed it on your Android device, this is the right one to use for scanning the QR code for an Android app.
QR Droid (6.8 MB), more than a scanner, it's also a reader and generator—scan QR codes from camera, decode them from saved images or from URLs of images, create QR codes from your contacts, installed applications, bookmarks, SMS and more.
