AFNetworking is a delightful networking library for iOS and Mac OS X. It has a modular architecture with well-designed, feature-rich APIs that are a joy to use.
MagicalRecord was inspired by the ease of Ruby on Rails' Active Record fetching and aims to bring this simplicity to Core Data
RestKit is a framework for implementing API clients for iOS and OS X. It has clean, well designed API's and features a powerful object mapping system integrated with AFNetworking and Core Data.
A framework for composing and transforming streams of values.
The AWS SDK for iOS provides a library, code samples, and documentation for developers to build connected mobile applications using AWS.
WordPress for iOS - Official repository http://ios.wordpress.org/
Free, world-wide, private phone calls for iPhone. Private messaging coming soon!