Couchsurfing.org is a very minimally organized group of travelers and couch owners that allows for a fairly quick and easy way to find a place to crash in whatever location you will find yourself in. They do unfortunately require a small one time payment and that you receive a card at your home address and then type the number written on it into the site, the upside is that this allows them to ensure at least partly that people are who they claim to be.

A word of advice for travelers using the site, try to go for the most full and verified profiles you can find when looking for a host, also read the reviews left by other travelers.