Meetup - Helps groups of people with shared interests plan events and facilitates off line group meetings in various localities around the world.
FlippAR Go - Your AR travel partner
Eventbrite - Discover Great Events or Create Your Own & Sell Tickets
LifeCouple - Monitor & grow your relationship
Bigtent - BigTent is a web-based organization and communication portal for groups.
Photo Find - Navigate to the exact spot a photo was taken