Zillow has snapped up a way to manage home listings. The Seattle-based online real estate portal has acquired Atlanta-based Bridge Interactive Group, which creates software that manages home listings for brokers and multiple listing services. Zillow Group Inc.'s websites allow customers to find both apartments for rent and houses for sale. More than 160 million people per month visit Zillow Group websites, such as Zillow, Trulia and HotPads. Many of those home listings come from Zillow's relationships...