Here are some suggested frameworks for iOS development, since I have used all of them quite a lot. I think they are good frameworks/libraries that you may need to know. It could save you a good amount of time in researching and reinventing the wheel.
CorePlot : Core Plot is a plotting framework for OS X and iOS. It provides 2D visualization of data, and is tightly integrated with Apple technologies like Core Animation, Core Data, and Cocoa Bindings.
CocoaHTTPServer is a small, lightweight, embeddable HTTP server for Mac OS X or iOS applications.
Sometimes developers need an embedded HTTP server in their app. Perhaps it’s a server application with remote monitoring. Or perhaps it’s a desktop application using HTTP for the communication backend. Or perhaps it’s an iOS app providing over-the-air access to documents. Whatever your reason, CocoaHTTPServer can get the job done. It provides: