ThinkCool - Make better decisions
Meetup - Helps groups of people with shared interests plan events and facilitates off line group meetings in various localities around the world.
onezone - An app to find & share a cool place to eat & drink
Eventbrite - Discover Great Events or Create Your Own & Sell Tickets
Choosing Helper - Make decisions easier: upload, compare, and choose.
Bigtent - BigTent is a web-based organization and communication portal for groups.