The OData Client library is designed to facilitate the connection with data services that use the OData protocol. The library can be used on iOS devices and MacOS.
Detailed information on the OData protocol and the other SDKs available can be found at http://www.odata.org
The download include a sample iOS application to browse the new NetFlix OData Catalog service hosted in Azure: http://odata.netflix.com/Catalog
The list of more services is available on the Producers
page on the OData.org Web Site