• Qreator in Launchpad

graphical utility for creating QR codes
 Qreator enables you to easily create your own QR codes to encode different
 types of information in an efficient, compact and cool way.
 .
 Qreator supports creating the following kinds of QR codes:
  - Business card
  - Geolocation
  - Phone call/SMS
  - Text
  - URL
  - Wi-Fi network

• libqrencode

QR Code encoder into PNG image
 Qrencode is a utility software using libqrencode to encode string data in
 a QR Code and save as a PNG or an EPS image.

$ qrencode ほげ -o - | display

• QR Tools in Launchpad

Qt frontend for QR code generator and decoder
 A Qt based software that help you to generate QR codes easily, scan
 an image file for QR codes and decode them or use your webcam to
 scan a printed one.