Have I Been Sold? - Check if your email address was sold without permission
QR.io - Generate fully customized QR Codes, with color shape & logo
Optery - See the private info data brokers post about you online
VisualCode - QR codes for everything
Creep Alert - Check if friends or colleagues track you via email
Uniqode - Uniqode: Revolutionizing QR Codes, Simplifying Solutions.