eiolca.net - Free Life Cycle Assessment on the Internet http://www.eiolca.net
Uses 1992 input-output table of US economy to show economic and environmental effects of producing 500 commodities. Environmental impacts of production are expressed in terms of Conventional Pollutants, Greenhouse Gases, Toxic Chemicals, and other releases.
Envest : Green Building Design Software http://www.bre.co.uk/envest
Software tool for estimating the lifecycle environmental impacts of a building from the early design stage. Considers the environmental impacts of: materials used during construction; resources consumed over the building's life.
LCAiT http://www.lcait.com
Software for life cycle assessment -- calculating the environmental performance of products, services, and organisations. "Light" version can be downloaded free.