Android in-app HTTP inspector
Asynchronous socket, http (client+server), websocket, and socket.io library for android. Based on nio, not threads.
Widely used networking for iOS and Mac OS X
Elegant HTTP Networking in Swift
Image component library for Alamofire
Easy-to-use wrapper around the CFNetwork API
CocoaAsyncSocket provides easy-to-use and powerful asynchronous socket libraries for Mac and iOS.