TravelPeri - Find top tourist attractions to explore, with travel times!
Party with a Local - Party with a Local is a free app that connects travelers with locals that want to party.
Rove.me - Travel guide that suggests you the best time to visit a destination based on experiences it offers.
Palaround - Meet people you should be friends with.
Inspirock - Inspirock creates customizable sightseeing itineraries for users based on their preferences.
Babble - A more personalized social network