craigslist - craigslist provides local classifieds and forums for jobs, housing, for sale, services, local community, and events
Hutsy - Make an all cash offer on your next home
classified-ads - Classified Ads is a web based free to use ad viewing and posting system that can be accessed from any part of the world to view the local ads of any area and location.
Riley - A personal assistant for apartment hunting
Gumtree - Gumtree is the first site for free classifieds ads in the UK. Buy and sell items, cars, properties, and find or offer jobs in your area.
Open Listings - Buy a home without a real estate agent.