Most readers know Pictometry, the company that provides oblique imagery with enough detail and tools to be used for measuerement. It did very well in the public sector in past years via many homeland security and other grants. I've not heard of EagleView, but here's its description of itself:
Since its inception in 2008, EagleView Technologies has become the leading provider of automated 3D measurement technologies serving the insurance and construction industries. With millions of measurement reports produced, customers rely upon EagleView’s patented technology and methods to provide scalable, efficient and highly accurate 3D measurements. The company’s product portfolio also includes related offerings such as EagleView Estimator, a simple, intuitive and powerful solution providing project estimates/bill of material and sales proposal capabilities to the construction industry, and the UnderWriter™Report, a risk management solution which integrates key parcel and property-centric data with measurement technologies for insurance carriers. For more information contact EagleView Technologies at (866) 659-8439 or visit us at eagleview.com.