Cyber Rentals
Thousands of entries. Special events rentals such as The Olympics, Marlin Fishing Tournament, etc. Also look for Owners Specials.

Holi-Swaps
The word "holi" is not a religious reference. It is short for holiday. Having cleared that up, this outfit offers free viewing of listings, and charges around $30 to list your home.

Home Exchange.com
Hospitality, vacation rentals, long term, and accessibility options.

Home Exchange International
Gives a good explanation about what Vacation Home Exchanging is all about and what you can expect the first time.

Invented City
Huge listing of homes available all over the world. They are founding members of the International Home Exchange Association and have been around since 1991. (that's a long time in this new world)

Seniors Vacation and Home Exchange
Exclusively for Seniors. They now list motorhomes, and caravans as well as homes, condos, apts. and cottages.

Sun Swap House Swapping and Vacation Home Exchange Service
Identifies more variables in their matching process than any other home exchange database I've seen on the web.