Hitch-Hiker's Registry - Web based club for hitchhikers and their friends, to keep in touch, share advice, and accommodate one another on their travels.

Hospex - Oldest web based club. Founded as a platform for contacts between traveling academics and students. Dormant at the moment.

Hospitality Club - Free network of people around the world who offer to exchange hospitality, accommodation, advice and help when they are traveling.

Hospitality Exchange - Publishes a paper membership directory twice a year, there is a membership fee.

Lesbian & Gay Hospitality Exchange International - Network of lesbians and gay men from around the world who offer their hospitality to other members.

TravelHoo - Web based accommodation network. By exchanging hospitality with other travelers, you can stay for free all over the world.

Servas - Largest and oldest club, founded in 1949 as a peace organization. There is a fee to join and membership applications cannot be made online.

Pasporta Servo - For people speaking Esperanto.

Teachers Travel Web - Open to all educators. Site also includes home exchange listings.

Women Welcome Women World Wide - For women only. Aims to foster international friendship by enabling women of different countries to visit one another. There is a membership fee.

Warm Showers List - List of Internet cyclists who offer their hospitality towards touring cyclists.

World for Free - Publishes a paper membership directory, there is a membership fee.

International Police Association - This organization includes a Hospitality Club for retired and active law enforcement officers.

Worldwide Homestay Exchanges - Site with a very small number of exchange offers, mostly from France. There is a membership fee.