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Barcode & QR Code Scanner - A free app which allow to read and generate barcodes for Android.
Scanbot - Scanbot is a mobile app that allows you to use your device's camera as a document scanner. The app is capable of scanning a large number of source materials, and it can handle QR codes as well.
QuickMark - QuickMark makes everything possible.
Dynamsoft Barcode Reader - 1D & 2D barcode scanner SDK for desktop, web & mobile
QR Droid - QR Droid Zapper
Geekersoft Optical Character Recognition - Free conversion of scanned PDF or pictures into editable Word, Excel, PPT and TXT documents.