Here's the overview from their current page.
Project Galileo is an easy-to-use planning tool for creating 3D city models from civil, geospatial and building data, and 3D models. Galileo also enables users to sketch conceptual infrastructure ideas within the 3D city model. Using Galileo, planners, GIS analysts, project managers, and architects can help stakeholders better understand infrastructure projects and plans in the context of the built and natural environment.
You can check out a preview video, looks interesting!