This project is an open and free App for SharePoint 2013. The QRCode App is an app part to generate dynamically QRCode in your SharePoint's pages. With this app part, you can insert qrcode with the URL or text of your choice and choose the size that you want.
The QRCode App is an open source tool distributed under MIT license by
Olivier Carpentier. This tool is based on the excellent
jquery.qrcode.js jquery extension by Jerome Etienne.
QRCode App Part inserted in a Wiki page:
Sample of the App Part in Edit mode: