From the Adoption in Pennsylvania site:

The Pennsylvania Adoption Exchange (PAE)

The Pennsylvania Adoption Exchange at www.adoptpakids.org maintains an ever-changing database of children who need families as well as families who have been approved to adopt. Matches between children and families are carefully made. PAE publishes a photo-listing book of waiting children. Interested families and social workers receive contact information for the agency that has custody of a child.

Statewide Adoption and Permanency Network (SWAN)

SWAN is a partnership among public and private agencies, judges and the legal community, foster and adoptive parents to build a better collaborative adoption process in Pennsylvania. SWAN serves children in the custody of county Children and Youth agencies who have a goal of adoption.