Affordable Housing Online	- national directory of affordable rental housing.
ApartmentSmart.com	- National Internet Listing Service for affordable rental housing
HUD	- primary Federal agency on affordable housing.
USDA, Rural Housing Service	- primary Federal agency on affordable rural housing.
QCT Sites	- QCTSites.com is the only online listing database of hand-picked Qualified Census Tract (QCT) and Difficult to Develop Area (DDA) development opportunities for affordable housing developers.
NAHB	- National Association of Home Builders.
CARH	- Council for Affordable and Rural Housing.