Boston
Boston Redevelopment Authority
Source of maps/zoning maps/aerial Photographs of Boston, and reports and resources.
City of Boston: Assessing Online
Contains property parcel data including assessed value, location, ownership and tax information for each piece of property in the city.
MetroBoston DataCommon
This site makes available a wealth of data about cities and towns in Massachusetts through a partnership between the Metropolitan Area Planning Council (MAPC) and the Boston Indicators Project.
Cambridge
Cambridge GIS
GIS website of Cambridge. Offers an online GIS tool called “Cambridge CityViewer”, containing city-wide information on parks, construction, parcel, sewer, zoning, water, and traffic, etc.