Meetup - Helps groups of people with shared interests plan events and facilitates off line group meetings in various localities around the world.
Party with a Local - Party with a Local is a free app that connects travelers with locals that want to party.
PartyUP - See videos from the best nightlife venues in your city.
Cool Cousin - Shaking up the travel world with good old human connection
WOOdate - Find, customize, and plan your entire date in one place.
Triip.me - The happiest way to travel in 227 countries