CVertex

uidevice-extension

Add functionality to UIDevice to distinguish between platforms like iPod touch 1G and 2G and iPhone

sscore

Cocoa code I use just about everywhere.

coreimagetool

A command line front end to Apple’s Core Image framework

ioctocat

iOctocat v1 - GitHub for iOS (works on the iPhone, iPad, and iPod Touch)

muikit

A collection of UI goodies for iPhone.

mogenerator

Core Data code generation

nib2objc

Set of tools and utilities (command line, GUI, Mac Service) to transform NIB files for the iPhone into Objective-C code files

nsdate-helper

A category to extend Cocoa's NSDate class with some convenience functions.

async-uitableview

Sample project using the ASIHTTPRequest to load the public Flickr RSS feed, and then load the images in a UITableView in asynchronous fashion

jstalk

Hammer

Parsing and pattern matching in Objective-C

three20

Three20 is an Objective-C library for iPhone developers

tabs_on_rails

Tabs on Rails is a simple Rails plugin for creating and managing tabs and navigation menus.

YRKSpinningProgressIndicator

A resizable, recolorable clone of the spinning NSProgressIndicator.

cocoa-helpers

A collection of helpers (categories) we've written for iOS and OS X, full with convenience methods to make them easier and more useful. [tags:cocoa,objective-c,ios,mac]

hpple

An XML/HTML parser for Objective-C, inspired by Hpricot.

gh-unit

DEPRECATED Test Framework for Objective-C

sinatra

Classy web-development dressed in a DSL (official / canonical repo)

OmniGroup

Source for many of The Omni Group's frameworks

nesta

File Based CMS and Static Site Generator

inflector

An implementation of the Ruby on Rails inflector in Objective-C.

scifihifi-iphone

Open source iPhone code

jekyll

:globe_with_meridians: Jekyll is a blog-aware static site generator in Ruby

iphone-scripts

iPhone- and App Store-related items

twitter4r-core

Core library for Twitter4R, which provides Ruby bindings for the Twitter REST API

raphael

JavaScript Vector Library

jitblt

Pixman with JIT compilation using COLA

asi-http-request

Easy to use CFNetwork wrapper for HTTP requests, Objective-C, Mac OS X and iPhone

aqtoolkit

A toolkit consisting of a bunch of generally useful routines and extensions I wrote when putting together other projects.

railscasts

railscasts.com in open source (outdated).