I’m glad to announce that since this morning, python-qrtools and QtQR are both available in their 1.4 version for download in the daily PPA (https://launchpad.net/~qr-tools-developers/+archive/daily)
The 1.4 version includes several bug fixes, support for saving the generated codes in several image formats besides PNG (with the collaboration of Joanthan Greig), no crashes when trying to decode from webcam and there is no webcam attached, support for «WiFi Networks» QR codes and a lot more!
What is coming next?
There won’t be anymore updates to the 1.4 version, don’t expect a QtQR 1.5. The next step is a complete rewrite of both the qrtools backend and, in consequence, of QtQR also. This will be the 2.0 version.-
Enjoy!
Cerebro.toBlog() 
I’m using QTQR 1.4 on Ubuntu. Works very well. About the only option I wish it had, was a simple one button click to add QR code, that has been scanned, into the copy past buffer. Or even a pluggin/addon that you could scan the code, right into a text entry field, like firefox.
You mean for example a button that says «decode and copy to clipboard» or something like that? It should be easy to add.