Bay Area Real Estate Information Services
Bay Area Real Estate Information Services (BAREIS) helps you find homes in the Bay Area quickly and easily.
http://www.bareis.com

National Real Estate Information Services
For more than 20 years, National Real Estate Information Services (NREIS) has supported both the residential and commercial mortgage and real estate industries with a comprehensive portfolio of services, including title, appraisal and settlement services.
http://www.nreis.com

Real Estate Information Network
REIN's primary purpose is to assist members in rendering better service to the public by providing a medium through which real estate may be merchandised promptly and efficiently, thereby benefiting both the selling and buying public.
http://www.reinmls.com/

Real Estate Information Sharing and Analysis Center
The Real Estate Information Sharing and Analysis Center (Real Estate ISAC) is a public-private partnership between the U.S. real estate industry and the federal government to counter terrorism and protect buildings and the people who occupy and use them.
http://www.reisac.org/