Real Estate Listings
http://www.homefinder.com
http://www.realtor.com
https://www.redfin.com/
Real Estate Listings & Home Value Estimates
http://www.zillow.com
http://www.trulia.com
Residential Rent Estimates
https://www.abodo.com/
https://www.rentometer.com
Commercial Real Estate Listings
http://www.loopnet.com
http://www.costar.com
Loans & Rates
http://www.bankrate.com/finance/mortgages/current-interest-rates.aspx
http://www.bankrate.com/mortgage.aspx
Appraisals & Valuations
http://www.appraisers.org/
Real Estate Glossary of Terms
http://www.realestateabc.com/glossary/
http://worklife.columbia.edu/real-estate-terminology
http://www.investopedia.com/categories/realestate.asp