ECOTECT is a complete building design and environmental analysis tool that covers the full range of simulation and analysis functions required to truly understand how a building design will operate and perform. It finally allows designers to work easily in 3D and apply all the tools necessary for an energy efficient and sustainable future. Check out it's features to learn more. (to find out more..)
A number of FREE tools are available as well along with commercial tools by Square One Research.
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posted by afterrabbit