RestKit is an Objective-C framework for iOS that aims to make interacting with RESTful web services simple, fast and fun. It combines a clean, simple HTTP request/response API with a powerful object mapping system that reduces the amount of code you need to write to get stuff done.

The goal of the x-callback-url specification is to provide a standardized means for iOS developers to expose and document the methods they make available to other apps.

Mobile alerts without building your own app.

iPhone Configuration Utility lets you easily create, maintain, encrypt, and install configuration profiles, track and install provisioning profiles and authorized applications, and capture device information including console logs.

An Objective-C library dependency manager

dependency management for iOS and OSX dev

Web Debugging for Safari on iPhone, iPad and PhoneGap

also links to a few other cheatsheets

A curated catalog of iOS frameworks and classes for the pragmatic iOS developer