QR.io - Generate fully customized QR Codes, with color shape & logo
Huntathon - Browse and submit Product Hunt Global Hackathon projects
VisualCode - QR codes for everything
Confs.tech - Open source list of tech conferences: JS / Ruby / Data etc.
QR Code Payments - Cashless transactions for your business
Ship That Shit - Join 3 no BS events to help you ship that shit