vovasty

SDWebImage

Asynchronous image downloader with cache support as a UIImageView category

AFNetworking

A delightful iOS and OS X networking framework

Ncurses-functions

Some functions for use with a curses library like Ncurses

appirater

A utility that reminds your iPhone app's users to review the app.

AOP-for-Objective-C

Small AOP library for iOS.

jrswizzle

one-stop-shop for all your method swizzling needs

TestWebKit

MBProgressHUD

MBProgressHUD, an iOS activity indicator view (official repository)