Calabash is an automated testing technology for Android and iOS native and hybrid applications.

Decent example of testing using OCMock and OCUnit.

unit tests for threaded code

BDD-style testing using Objective-C

Zapp is an app that continuously runs your KIF tests, polling your remote repository for changes and running your Xcode builds.

A simulated version of the iPhone's StoreKit, for testing store UIs on the iPhone Simulator, or even on device without having to set up IAP in Connect.

Smarter assertion macros for your OCUnit tests

Testing conveniences for Mac OS X

Visual walkthrough for getting GHUnit working in your iPhone project.

ZenTest’s autotest is great, but it has one drawback: In order to detect whether you have modified a file, it relies on filesystem polling. In other words it constantly traverses the filesystem and thus causes a lot of CPU and harddrive load. Check this out..

Kiwi is a Behavior Driven Development library for iPhone and iPad development. The goal is to provide a BDD library that is exquisitely simple to setup and use.