SRGMediaPlayer-iOS - The SRG Media Player library for iOS delivers a very simple way to insert a universal audio / video clip participant to any iOS application. FSNetworking - Foursquare iOS networking library. CocoaAsyncSocket - Asynchronous socket networking library for Mac and iOS. RestKit - RestKit is an Objective-C framework for iOS that aims to make interacting with RESTful web companies basic, fast and fun.