XcodeColors allows you to use colors in the Xcode debugging console. It's designed to aid in the debugging process.

MBProgressHUD, an iOS activity indicator view

URLCache subclass with on-disk cache support on iPhone/iPad. Forked for speed!

An xcconfig (Xcode configuration) file for easily turning on a boatload of warnings in your project or its targets.

Implements Core Data + iCloud, deals with all the nasty stuff and gives you a clean API.

A maintained fork of PaymentKit from Stripe, updated for iOS 7

A fork of Ole Begemann's custom scroll view project, that adds decelerated scrolling, just like `UIScrollView`

Afloat is a Mac extender that adds useful window management commands to most Mac apps.

iOS annotation view with custom callout bubble

An iPhone ready, Objective-C implementation of an OAuth consumer.

A wrapper for the iPhone's C-based AddressBook framework.

SCPagingGridView is a collection of iOS viewcontroller containers, views, & helpers.

RestKit is a framework for consuming and modeling restful web resources on OS X and iPhone/iPad

tap + haiku = tapku, a well crafted open source iOS framework for iPhone & iPad

Drop in sharing features for all iPhone and iPad apps

Toast is an Objective-C category that adds Android-style toast notifications to iOS.

A UIView subclass that displays YouTube videos using a MPMoviePlayerController.

Custom UIView for iOS that pops up an animated "bubble" pointing at a button or other view. Useful for popup tips.

Getting UIScrollView to behave more like Photos.app (small images are centred rather than shifting to the top left of the UIScrollView)

Demonstration of Tesseract OCR on the iPhone. Video: http://www.youtube.com/v/MICew5-nZp4?hl=en_US&fs=1

A UIImageView subclass which allows you to align the image left/right/top/bottom, even when contentMode is AspectFit.

ARC and GCD Compatible Reachability Class for iOS and MacOS. Drop in replacement for Apple Reachability

a Tweetie-style tab bar for the iPhone

The iOS Ad-Hoc updater

This is an alternate to EGORefreshTableView that uses gestureRecognizer instead of UIScrollView's delegate.

Horizontal and vertical scrolling table views for iOS

With MPOAuthConnection, all the work of talking to secure web services is taken care of for you so you only have to focus on how you want to use the data the remote web service provides.

Small library of visual debugging tools for iOS.

KKPasscodeLock is an iOS toolkit for adding a passcode view controller and passcode settings in ios apps.

Open source code for the idevrecipes.com blog