Here is contact information for some schools that function a bit like MFS:

The Albany Free School
8 Elm Street
Albany, New York 12202     
(518) 434-3072
www.albanyfreeschool.com

The Brooklyn Free School
120 16th Street
Brooklyn, New York 11215
(718) 499-2707
www.brooklynfreeschool.org

The Sudbury Valley School
2 Winch Street
Framingham, Massachusetts 01701
(50) 877-3030
www.sudval.org

Summerhill School
Leiston
Suffolk
IP16 4HY
UK
www.summerhillschool.co.uk

Below is contact information for some organizations that support democratic schools:

Alternative Education Resource Organization (AERO)
417 Roslyn Road
Roslyn Heights, New York 11577
(800) 769-4171
http://educationrevolution.org

The International Democratic Education Network (IDEN)
http://www.idenetwork.org/index.htm