iTerm2 is a terminal emulator for Mac OS X that does amazing things.

RestKit is a framework for consuming and modeling RESTful web resources on iOS and OS X

A software update framework for macOS

A window management application (replacement for Divvy/SizeUp/ShiftIt)

Three20 is an Objective-C library for iPhone developers

The iOS framework that grows only as fast as its documentation

Cocos2d for iOS and OS X, built using Objective-C

Remake of the popular iPhone game.

iPhone game

CoRD is a Mac OS X remote desktop client for Microsoft Windows computers using the RDP protocol. It's easy to use, fast, and free for anyone to use or modify.

iPad game

Centralized gestures and button management for iOS

WebSocket support for PhoneGap (iPhone)