Greater Toronto Area

Durham Region Real Estate Board
http://www.durhamrealestate.org/

Hamilton-Burlington & District Real Estate Board
http://www.hbdreb.on.ca/

Oakville, Milton & District Real Estate Board
http://www.omdreb.on.ca/

Office Space Toronto
http://www.torontoici.com/

Smith Company
http://www.smithcompanytoronto.com/
A provider of commercial real estate services. Informative website provides market trends and an email option for weekly real estate news. 

Toronto Real Estate Board (TREB)
http://www.realestate.ca/tabs/homesforsale/toronto

Ontario

Ontario Real Estate Association (OREA)
http://www.orea.com/index.cfm/ci_id/119/la_id/1.htm

Canada

Canadian Institute of Public and Private Real Estate Companies
http://www.cipprec.ca
"The voice of Canadian real estate developers and investors".

Canadian Real Estate Association
http://www.crea.ca/

Multiple Listing Service (MLS) Online
http://www.mls.ca/mls/home.asp
"The official gateway to all Canadian MLS¨ information sponsored by The Canadian Real Estate Association".

Real Estate Institute of Canada (REIC)
http://www.reic.com/

International

North American Real Estate Review (NARER)
http://narer.com

Pike Net
http://pikenet.com/
"Real Estate's eMarketplace · Connect, Communicate, Collaborate"