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Party with a Local - Party with a Local is a free app that connects travelers with locals that want to party.
Postcrossing - A postcard exchange project that invites everyone to send and receive postcards from random places in the world. For free!
Cool Cousin - Shaking up the travel world with good old human connection
swap-bot - Swap-bot is a online service that organizes group swaps and a community of creative individuals.
Triip.me - The happiest way to travel in 227 countries
BookCrossing.com - It's the World's Library. It's a smart social networking site.