Party with a Local - Party with a Local is a free app that connects travelers with locals that want to party.
BookMooch - BookMooch is a community for exchanging used books.
Atmospheir - Fastest way to discover, connect and chat with your contacts
swap-bot - Swap-bot is a online service that organizes group swaps and a community of creative individuals.
Overnight - Book a last minute room with locals, in seconds.
SLOWLY - Make pen pals from your smartphone