Kaywa QR Code - Kaywa QR Code is a QR-Code Generator.
Inkscape - Inkscape is a free, open source professional vector graphics editor for Windows, Mac OS X and Linux.
ZXing Project QR Code Generator - Generate QR Codes.
Sketch - Professional digital design for Mac.
GNU-Barcode - GNU Barcode is a tool to convert text strings to printed bars.
Affinity Designer - Professional creative software, exclusively for Mac.