York County Audubon Society
- A non-profit organization dedicated to the conservation of the environment and, through education, the nature around us.
- http://www.yorkcountyaudubon.org/

Tide Chart Index Southern Maine and Casco Bay
- Individual monthly Tide Charts for harbors from South Harpswell to Kittery Point.
- http://www.maineharbors.com/tide1.htm

Friends of Sebago Lake
- Features environmental concerns about the health of Sebago Lake and its watershed, especially its connection to Casco Bay and the Atlantic Ocean, the Presumpscot River. History of organization and the Sebago salmon available.
- http://friendsofsebago.org/