- 4H Nature Navigators
- Barnstable Clean Water Coalition
- Burns Environmental Services
- Buzzards Bay Coaliton
- Cape Downwinders
- Cape Cod Museum of Natural History
- Forest Stewards Guild
- Harvard Forest
- Herring Ponds Watershed Association
- Hitchcock Center for the Environment
- Keep Massachusetts Beautiful
- Living on Earth
- Manomet, Inc.
- Marion Institute
- Marion Natural History Museum
- Mass Audubon
- Massachusetts Maritime Academy
- Migration Productions
- MIT Sea Grant
- Native Plymouth Tours
- Native Tree Society
- Noble and Greenough School
- North & South Rivers Watershed Association
- Pinewoods Camp
- The Polly Hill Arboretum
- Rising Tide Public Charter School
- Roger Williams Park Zoo
- Salicicola
- Save the Bay - Narragansett Bay
- Southeastern Massachusetts Pine Barrens Alliance
- Sierra Club
- Six Ponds Improvement Association
- South Shore Natural Science Center
- Sustainable Cape
- The Thornton Burgess Society
- Unity on Cape Cod
- Union of Concerned Scientists
- Westport River Watershed Alliance
- Whale and Dolphin Conservation
- WHOI Sea Grant
- Wild Care, Inc.
- Wildlands Trust of Southeastern Massachusetts