Amateur Telescope Makers of Boston (ATMoB): Club supporting observation, star parties, telescope design/building/improvement and astro-photography.
Assabet River Rail Trail: Non-profit organization to create, promote, and help maintain a multi-purpose recreational trail through the communities of Marlborough, Hudson, Stow, Maynard, and Acton.
Charles River Natural Valley Storage Area: Includes flood control, recreation, and preservation information.
Eastern Massachusetts Hawk Watch: Information on where are the best hawk sighting locations, how to report a sighting and volunteering for the organization.
NE Soil: Featuring soil information by county, ground penetrating radar, GIS, and soil profile photos.
Organization for the Assabet River: Works to preserve and protect the health and beauty of the Assabet River and its watershed.