gLabels - gLabels is a program for creating labels and business cards for the GNOME desktop environment.
Kaywa QR Code - Kaywa QR Code is a QR-Code Generator.
QZ Tray - Print raw (ZPL, ESC/P, FGL), HTML, PDF as well as communicate with USB, HID, and serial devices...
Scanova.io - QR code generator, designer, and campaign management tool.
NiceLabel - NiceLabel is a label design and label management systems that help companies of all sizes to enhance the quality, efficiency and speed of their labelling while reducing cost.
GNU-Barcode - GNU Barcode is a tool to convert text strings to printed bars.