Listing Price and Estimated Value

[Ryan H.]

Are there are any software tools out there that can quickly show (for a list of properties) both the listing price and estimated value of the property?  You can of course do this by opening up a specific property on sites like Zillow and Redfin, but what I'd like is to see this summarized for multiple properties without having to dig into each individual listing, to get a quick idea of which properties are likely listed at or below their actual values.

Ryan