Cool Cousin - Shaking up the travel world with good old human connection
BookCrossing Core - Create own BookCrossing site based on Drupal CMS.
FriendsTonight - Meet new friends to join your friends, tonight
BookMooch - BookMooch is a community for exchanging used books.
Overnight - Book a last minute room with locals, in seconds.
swap-bot - Swap-bot is a online service that organizes group swaps and a community of creative individuals.