BarMaker is a convenient tool that help you create/scan QR Code or Barcode images. You can use it to create/scan QR Code from contacts, clipboard and text. You can connect external USB Camera to scan barcode. You can also push the result into PC after scanned and visit the Scanning Result from PC/Mac's browser. After you have created it, you can share the QR Code or Barcode image with you friends, or output to printer directly. Finally, you can make a widget from barcode and put it on desktop or lockscreen. It also supports scanning for white barcodes on black background. 

BarMaker supports following formats: 
QR Code 
Code-39 
Code-128 
EAN-8 
EAN-13 
ITF 
UPC-A 
Codabar 
PDF 417 
Aztec 
DataMatrix

Can create QR / Barcode, or scan QR / Barcode via built in Camera or USB Camera