The iPhone platform now has more than 200,000 and counting in practically every category. We have introduced the Great Free iPhone 4 GUI PSD Templates For Designers and some iPhone Application Development Resources.For
developers, read the source code by others is another good way to
improve the develop ability and code quality. Here is a collection of
50+ open source iPhone Apps for iPhone developers. Enjoy!

ABC123 – Sequence


ABC123 is an interesting game for iPhone, iPod touch and iPad.

“Simple in concept. Brilliantly addictive. Maddeningly challenging.” – TheYoshi

Memorize the sequence of letters or numbers. The sequence will then
be covered with bubbles. Pop the bubbles in the order of the sequence to
beat the level. DownloadSource Code Download

ABC123 Sequence

Colloquy – IRC Client


Colloquy for iPad, iPhone and iPod touch puts the power of the most
popular IRC client for the Mac in the palm of your hand. Built atop the
Chat Core framework, Colloquy Mobile is a full featured client optimized
for the on-the-go experience with iOS 4 multitasking support. DownloadSource Code Download

Colloquy IRC Client

Diceshaker


Diceshaker is a little dice-rolling utility for your roleplaying
sessions and board games. It’s designed to be simple, uncluttered and
easy to use. DownloadSource Code Download

Diceshaker

DOOM Classic


DOOM Classic includes the original three episodes as well as Episode
Four, Thy Flesh Consumed, spread across 36 levels of non-stop carnage
and action.

In DOOM Classic, multiplayer action is reborn! With a wireless
connection, battle up to four players in Deathmatch mode, or work
together cooperatively and fight back against the demons of Hell.  DownloadSource Code Download

DOOM Classic

Echofon for Twitter


Echofon is an easy to use, super-fast Twitter app for the iPhone and iPod Touch.

It’s easy to do common Twitter tasks such as viewing your timeline,
messages, replies, lists and favorites. Echofon has a powerful
tweet-authoring where you can write tweets, take photos, record video
(3GS only) and update your current location. DownloadSource Code Download

Echofon for Twitter

Gorillas Lite By Lhunath


Gorillas is a port of the original GORILLA.BAS to the iPhone platform.

It’s a turn based single player game where the objective is to blast your opponent away using carefully aimed bananas.  DownloadSource Code Download

Gorillas Lite By Lhunath

London Tube Status


Get up to the minute service level details on all London Underground tube lines, DLR and Overground. Features:

• Line Statuses & Station Messages
• Weekend Closures
• Easily Reorder Lines
• Shake To Refresh!

 DownloadSource Code Download

London Tube Status

MiniBooks Lite for FreshBooks


MiniBooks Lite puts the popular web invoicing software FreshBooks in
the palm of your hand. Manage your clients, send invoices, run timers,
and record payments, all while on the go. Plus, MiniBooks Lite fully
synchronizes with your FreshBooks account, so you have access to your
account even when you’re off the grid.  DownloadSource Code Download

MiniBooks Lite for FreshBooks

Mobilesynth by Allen Porter


Mobilesynth is an open source classic monophonic synthesizer,
designed for live performance. Developers are encouraged to visit the
website and contribute. DownloadSource Code Download

Mobilesynth by Allen Porter

mobileterminal A GUI Terminal application for the iPhone


This is the home of MobileTerminal.app, a terminal emulator
application for the iPhone. MobileTerminal.app is NOT an SSH client, nor
Telnet for that matter. It can however be used to execute a console
ssh-client application.

mobileterminal A GUI Terminal application for the iPhone 

Molecules


Molecules is an application for viewing three-dimensional renderings
of molecules and manipulating them using your fingers. You can rotate
the molecules by moving your finger across the display, zoom in or out
by using two-finger pinch gestures, or pan the molecule by moving two
fingers across the screen at once. Double-tapping on the display lets
you switch visualization modes.  DownloadSource Code Download

Molecules

Mover+ By Infinite Labs


Mover+ is the quickest way to move stuff from iPhone A to iPhone B,
with style. Put what you want to send on the Mover table, connect via
Wi-Fi or Bluetooth, and flick it offscreen where you want it to go! See
the video demo at http://infinite-labs.net/mover/.

Mover+ works with video shot by your iPhone 3GS, and on all iPhone
and iPod models with photos, contacts, web bookmarks and text clippings.
Mover+ works best when transferring over Wi-Fi and can also connect
compatible iPhones and iPod touches over Bluetooth in a pinch.  DownloadSource Code Download

Mover By Infinite Labs 

NatsuLion for iPhone


“NatsuLion for iPhone” (a.k.a. “NatsuLiphone”) is a simple Twitter
client for iPhone/iPod touch. It has simple, fast, and slick
user-interface to enjoy Twitter. It’s based on NatsuLion for Mac OSX and
it’s open source application, too.  DownloadSource Code Download

NatsuLion for iPhone

PackLog


Introducing PackLog for Backpack. The easiest way to update your
Backpack status and add journal entries right from your iPhone or iPod
touch!

Unwind at the end of the day and review everything that you and your fellow Backpackers got done.  DownloadSource Code Download

PackLog

PocketFlicks By Cyrus Najmabadi


With iPhone and PocketFlicks you can find movies and manage your
Netflix information, all while on the go. Heard about a great movie from
a friend of yours? Whip out PocketFlicks and add it to your Netflix
queue with just a few clicks. You’ll never forget about a movie you want
to watch now!  DownloadSource Code Download

PocketFlicks By Cyrus Najmabadi

SCI-15C Scientific Calculator


The SCI-15C is the most accurate and precise emulator of the
world-renowned HP 15C RPN high-end scientific programmable calculator
available for the iPhone and iPod Touch. We use the *exact same*
mathematics and calculations of the original to give you reliable,
bug-free, precision and accuracy that you can trust.

It can perform numerical integration and solve the roots of equations
in addition to supporting complex numbers and matrix calculations. DownloadSource Code Download

SCI-15C Scientific Calculator

Task Coach App for iPhone and iPod Touch


Task Coach is a simple open source todo manager to keep track of
personal tasks and todo lists. It grew out of a frustration that most
task managers do not provide facilities for composite tasks. Often,
tasks and other things todo consist of several activities. Task Coach is
designed to deal with composite tasks. In addition, it offers effort
tracking, categories, and notes. Task Coach is available for Windows,
Mac OS X, Linux, and iPhone and iPod Touch.

This is the iPhone version of the open-source Task Coach desktop
application (http://www.taskcoach.org/). It features basic task editing
and synchronization with its desktop counterpart over the network..DownloadSource Code Download

Task Coach

The official Last.fm iPhone application


You can listen to more than 5 million tracks for free with Last.fm on
your iPhone. Create personal radio stations based on any artist or
genres, and listen to commercial free music for hours. With Last.fm on
the iPhone you can also check out artist bios and concert information
and share your favourite tracks with your friends using the iPhone
contact list. DownloadSource Code Download

The official Last.fm iPhone application

Tris Tetris clone for the iPhone


This project is intended as an example both of general programming
practices within the iPhone frameworks and of attractive interface and
effective interaction design for the iPhone platform.

Tris Tetris clone for the iPhone

Tweejump


Tweejump is a jumping arcade game inspired by many wonderful games including Icy Tower, Doodle Jump, PapiJump, and others. DownloadSource Code Download

Tweejump

tweetero By Tristero Consulting


Tweetero is a Twitter client with image upload support. DownloadSource Code Download

tweetero By Tristero Consulting

wikiHow: How to and DIY Survival Kit


The application includes the ‘wikiHow Survival Kit,’ a collection of
articles to get you through life’s most difficult situations. Includes
articles on first aid such as CPR, the Heimlich maneuver, treating burns
and bleeding. It also contains wilderness life-savers like how to build
a fire or find North without a compass. And you never know when you
might need some of the more “unexpected scenario” articles like how to
escape from a bear, how to regain control of a spooked camel, or how to
survive a riot. Because you never know when you will need this
information , the wikiHow Survival Kit is always available – with or
without a cellular connection or a Wi-Fi network DownloadSource Code Download

wikiHow How to and DIY Survival Kit

WordPress By Automattic


It’s easy to manage your WordPress blog from your iPad, iPhone, or
iPod touch. With WordPress for iPhone OS, you can moderate comments and
create or edit posts and pages. All you need is a WordPress.com blog or a
self-hosted blog running WordPress 2.9.2 or higher. DownloadSource Code Download

WordPress By Automattic

Your Rights By Cyrus Najmabadi


If government agents question you, it is important to understand your
rights. You should be careful about what you say when approached by law
enforcement officials. If you give answers, they can be used against
you in a criminal, immigration, or civil case.

‘Your Rights’ provides effective and useful guidance in a
user-friendly question and answer format. The application addresses what
rights you have when you are stopped, questioned, arrested, or searched
by law enforcement officers. This booklet is for citizens and
non-citizens with extra information for non-citizens in a separate
section.

‘Your Rights’ tells you about your basic rights. It is not a
substitute for legal advice. You should contact an attorney if you have
been arrested or believe that your rights have been violated. DownloadSource Code Download

Your Rights By Cyrus Najmabadi

31 iPhone Example Apps


Here you will find 31 examples to help you get started as an iPhone developer.

31 iPhone Example Apps

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