A dated wikipedia site for QR Code apps. This is dated, more technology are currently available while some of the mentioned 32 bit SDKs do not have a 64 bit version. Still most of the ideas found here are all sound and applicable.
Chain Letters from Above - Curated Articles on my interest in Travel, Aesthetics, and Ethics. It is also a compilation of letters and articles I receive from friends!
2d Barcodes Today - Curated Articles on Barcodes, Industrial packing and packaging
QR Codes Beacons and NFC - Curated Articles on QR Codes, Beacons NFC, RFID and payment solutions!