IDX (Internet Data Exchange) and MLS (Multiple Listing Service) are terms used in real estate for online listing services. All major websites, such as Homes.com, Realtor.com, and Trulia.com, have access to all or many MLS boards nationwide and even outside the United States for their real estate search functions. Most agents also have an MLS search, although their own sites. Typically, a web host offers access to its own user solution or through a third-party user, for example, iHomefinder.com or idxbroker.com.
IDX data channels are usually limited to realtors and brokers for the MLS boards of which they are members. Realtors or brokers can get a consultant to access the feed. For the feed to which we have access, we needed to have authorization forms signed by both the realtor and their broker, and then send a fax before gaining access to ftp for raw filing. Even the web hosts above must approve the MLS board before they allow access to their search. MLS boards have strict rules that you must follow. And, of course, not all MLS boards are similar, so read the rules.
In terms of software, I saw some open source software at SourceForge but didn't look any further. A quick search led to these two.
http://www.real-estate-website.org
http://reos.elazos.com
If anyone has others, add them.
Brandon
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