Auction.com - foreclosures
Bankrate.com - includes mortgage calculators and interest rates
BiggerPockets.com - real estate investing website, blog, etc.
CRE Finance Council - The Voice of Commercial Real Estate Finance
Federal Housing Finance Agency
FRED Economic Research - average sales price of homes in the US
Harvard Joint Center for Housing Studies
Hubzu - real estate auctions
HUDuser- clearinghouse for housing, sustainable communities, and research & data
LoopNet - find commercial and industrial real estate listings for sale/lease
National Association of Affordable Housing Lenders
Realtor.com - residential property listings
Urban Land - industry sectors, capital markets, trends, sustainability, development, planning/design
U.S. Dept. of Housing and Urban Development
Zillow - residential property listings for sale and for rent