Vajro - Vajro helps brands create native iOS and android apps for their Shopify stores without any coding.
VisualCode - QR codes for everything
Sampulator - Make (and record) beats on your keyboard
Link to QR - Free beautiful QR codes
HoneyApps - HoneyApps is a dedicated Shopify Apps development company that builds professional solutions for your eCommerce website.
Visualead - Visual QR code generator