There is a membership fee. Oldest web based club. Founded as a platform for contacts between traveling academics and students. Dormant at the moment. Seniors host seniors, providing hospitality and free lodging.
Site also includes home exchange listings.
Web based accommodation network. By exchanging hospitality with other travelers, you can stay for free all over the world. Site with a very small number of exchange offers, mostly from France. There is a membership fee. Help build the largest human-edited directory on the web.