QRazyBox is a web-based application (a toolkit), that used to analyzing and recovering damaged QR Code.
QRazyBox lets you recover QR Code by redrawing and reconstructing it with Paint-like editor. It also provides several sub-tools to help you analyze and recover faster and more efficient.
Reconstruct QR Code by drawing pixel by pixel
Decode and read unscannable QR Code
Save and load existing work for later use
Import/export QR Code from/to Image file
Currently support up to QR Code Version 6 (41x41)
Support both Error and Erasure Correction using universal Reed-Solomon decoder
Extract valuable information although from badly damaged QR Code
Simulate data unmasking for manual data analysis
Easy to use
Free and open source :)