GNU-Barcode is an open source project that provides an easy-to-use software application for generating and printing barcodes. It is written in C and supports all popular linear and two dimensional barcode formats such as Code 39, Code 128, EAN-13, UPC-A, QR Code and DataMatrix. The application also supports advanced features such as image scaling, border width, and color selection. The generated barcode images can be printed or exported to a variety of popular formats including PDF, PNG, JPEG, and SVG. GNU-Barcode is a great tool for anyone who needs to generate and print barcodes quickly and easily.
Discontinued It is no longer updated. You can try to use it with versions higher than 3.6 by disabling the Compatibility Check.
Discontinued is not compatible with newer versions of Firefox, etc.: https://addons.mozilla.org/en-US/firefox/addon/OfflineQR/