The document lists the top 10 free online QR code generators: 1) ZXing Project, 2) BeQRious, 3) Delivr, 4) Azonmedia, 5) Maestro, 6) goQR.me, 7) Online Qr Lab, 8) Mobile-Barcodes, 9) KAYWA, and 10) BeeTagg. It provides references to two additional sources that reviewed free online QR code generators.