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Name: Couch surfing
If you're really watching the pennies, Couch surfing is an online community of travelers who offer their couch when they're back home for a time, for free.
In the same way as a hostel or hotel, you can 'book' (request) a certain time or number of nights to 'surf' in someone's living room.
Each profile comes with ratings, peer reviews and comments on the stay, as well as location and surfer preferences.
I've used the service a few times when backpacking, and as long as you do your research, it's an easy way to find somewhere to stay for the night.