Another most popular IDX provider is iHomefinder that provides the Optima ExPress + MarketBoost iDX plugin. The plugin allows displaying MLS property listings and real estate search on your WordPress website.
Here you can download uListing iHomeFinder plugin.
You can display listings by using shortcodes and widgets.
iHomeFinder Map Search
iHomeFinder Search Forms
iHomeFinder Sell My House Form
For a detailed overview, see the - Optima Express + MarketBoost IDX description here.