Green Building Studiohttp://www.autodesk.com/
Autodesk® Green Building Studio is a flexible cloud-based service that allows you to run building performance simulations to optimize energy efficiency and to work toward carbon neutrality earlier in the design process. Green Building Studio® will help extend your ability to design high performance buildings at a fraction of the time and cost of conventional methods.
Autodesk® Green Building Studio® can be used as a standalone web service. It also powers Autodesk® Revit’s® whole building energy analysis tools (available to Autodesk Subscription customers).