The Google Places iOS library by Lukas Kukacka uses a simple block interface to interact with the features of the API that include mapping, localization, and reference. This project offers place search, with nearby search and text search. It also provides places details, with a more detailed information about a specific location. Available as CocoaPods.
Two of the biggest brands in local search are partnering and they're using open APIs to do it. Citysearch is including sponsored ads from YP.com (Yellow Pages) in its CityGrid ad network (our CityGrid API profile). Additionally, Citysearch reviews show up across the YP.com website.
Micello is living my dream. This company is specializing in providing a navigation system for indoor environments. Indoor environments can be unpredictable and complex spaces. In other words they are the ideal scenario for maps. Micello has seen this opportunity and seized it by establishing a fast growing collection of indoor maps. The map collection is open for integration through both an embeddable HTML 5 element and RESTful calls to the Micello API.