Recommendations for Due Dilligence?

[Kelvin Urena]

Does anyone have any recommendations for software/sites to use for conducting more extensive due diligence on properties throughout the country? When living in NY, I often used software that was specifically designed for the city (ie. Streeteasy) to better assess ARV (After Repair Values, for the newbies), as well as things like Rentometer, PropertyShark, and more, yet I wanted to see if anyone has any better suggestions. 

I would appreciate suggestions that could especially help with creating Comparable Reports. Thank you, guys!