Mashvisor - Find properties that will make money on AirBnb
RentCast.io - Look up accurate rent prices and comps for any property, and track your rental portfolio with real-time alerts and market updates. Available nationwide in the US.
Rehab Valuator - Rehab Valuator is an impressive piece of real estate software that is primarily designed for rehabbers, flippers, and wholesalers.
AIRDNA - Airbnb listings analytics
TWIPLA - The Website Intelligence Platform
Zillow - Is that home for sale? What is it worth? Where can I find foreclosures? Stop wondering!