Simple, modern, thread-safe key-value observing for iOS and OS X.

ChatSecure is a free and open source encrypted chat client for iOS that supports OTR and OMEMO encryption over XMPP.

open source implementation of Twitter/iPad stacked ui - done right.

An alternative to Core Data for people who like having direct SQL access.

Practical real-world dates

Q Branch’s collection of Cocoa categories and utilities.

An open source implementation of the Fountain screenplay formatting language.

Flappy Block No Mercy: You lose the game and you have to quit the app.

Professional iOS Augmented Reality book (Apress). Code samples

A location-based augmented reality environment for the iPhone.

An Objective-C Off-the-Record library for iOS.

Cop Recorder for iOS Devices - www.openwatch.net

Customized Accessory Views for UITableViewCell