The QR benchmark set: QR codes under damage, hand-shake and rotation, each with its expected text; a viewer that runs any scanner through it on a monitor and a scorer. Verdetto's own, CC0.
Every symbology Zint encodes, rendered clean and put through graded damage: 100 formats, 10,840 images, each with the exact text its symbol carries. A ceiling test for a barcode reader. Images CC0, scripts MIT.