Meetup - Helps groups of people with shared interests plan events and facilitates off line group meetings in various localities around the world.
Uniqode - Uniqode: Revolutionizing QR Codes, Simplifying Solutions.
Facebook Local - Discover places to go and events happening near you
QR Code Generator For Developers - A quick API to generate QR codes in your apps
Eventbrite - Discover Great Events or Create Your Own & Sell Tickets
The QR Code Generator - Free Online QR Code Generator to make your own QR Codes. Supports Dynamic Codes, Tracking, Analytics, Free text, vCards and more.