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.
Tesseract - Tesseract is an optical character recognition engine for various operating systems
Scanner Pro - Scanner Pro turns your iPhone into portable scanner in your pocket.
GOCR - GOCR homepage. GOCR is an OCR (Optical Character Recognition) program, developed under the GNU Public License.
Genius Scan - On The Go.
TextGrabber - Office & Productivity