Federal National Mortgage Association

Fannie Mae

Fannie Mae purchases mortgages from banks and other mortgage-lending institutions and, in turn, sells these mortgages to investors, and guarantees the repayment of the principal and interest on the loans that it sells.
Federal Home Loan Corporation

Freddie Mac

Freddie Mac purchases mortgages from banks and other mortgage-lending institutions and, in turn, sells these mortgages to investors, and guarantees the repayment of the principal and interest on the mortgages that it sells.
Federal Housing Administration

The FHA markets mortgages to people that may not qualify for traditional loans.
Veterans Administration

The VA Loans are a fixed-rate mortgage for veterans of the US Military.
They require no down payment as long as the appraised value of the home is within a certain amount.