Great collection of iOS Resources

Learning Resource
http://www.buildingiphoneapps.com/2011/04/great-learning-resources-for-ios.html

[advanced] http://oleb.net/blog/2011/04/best-ios-and-mac-development-related-links-march-2011/

[advanced] http://nachbaur.com/blog/ios-development-link-roundup-part-1

Open Source
[UIkit] http://iosframeworks.com/

http://cocoacontrols.com/

[Crash Report] http://code.google.com/p/plcrashreporter/

DTAttributedTextView is used for displaying HTML-formatted comments without UIWebView

libxml2: for scraping

enormego and three20: pull-to-refresh

Telekenesis: URL parsing from

MWFeedParser: HTML entities

atebits: smoothness

News YC (http://newsyc.me/??) open source hacker news client

https://github.com/newsyc/newsyc

http://kstenerud.github.com/ObjectAL-for-iPhone/


http://opensource.apple.com/release/ios-43/

http://www.iphoneexamples.com/

[OpenGLES] http://www.iphonedevsdk.com/forum/iphone-sdk-tutorials/14934-opengl-es-iphone.html

Via Stack Over Flow

http://stackoverflow.com/questions/1939/how-to-articles-for-iphone-development-and-objective-c

1) Blogs on iPhone development:

http://mycodeteacher.com/

http://iphonedevelopment.blogspot.com/

http://iphoneincubator.com/blog/

http://iphone.zcentric.com/

http://iphoneproghelp.blogspot.com/ (Programming Tutorial)

http://icodeblog.com/ (Programming Tutorial)

http://idevrecipes.com/

2) iPhone Source Code:

http://www.theiphonedev.com/SourceCode/tabid/143/Default.aspx

3) Community:

http://www.iphonekicks.com/

https://devforums.apple.com/

http://iphonedevsdk.com/

4) News:

http://mobileorchard.com/

http://theappleblog.com/

5) Jail breaking/Hacking:

http://theiphoneproject.org/

6) Open source libraries and Applications:

http://www.codingventures.com/2008/12/useful-open-source-libraries-for-iphone-development/#more-43

http://www.sourcemac.com/

http://www.codeplex.com/

Face Detection: http://niw.at/articles/2009/03/14/using-opencv-on-iphone/en

Bar Code: barcode framework for the iphone?

Rating: http://github.com/eisernWolf/TouchCustoms

http://github.com/erica/iphone-3.0-cookbook-

Is there a gallery of reusable iPhone components on the web?

http://mattgemmell.com/source

Are there any Open-source iPhone applications around?

Open source iOS components? Reusable views, controllers, buttons, table cells, etc?

http://www.cocoacontrols.com/

http://open.iphonedev.com/

http://www.opensourceresources.org/

http://www.raywenderlich.com/tag/sample-code

Three 20: http://github.com/facebook/three20

Tapku Library: http://github.com/devinross/tapkulibrary

7) Topic-wise:

App Store: https://developer.apple.com/appstore/resources/approval/guidelines.html

GIF Support: http://stackoverflow.com/questions/1379818/how-can-i-make-an-animated-gif-with-the-iphone-sdk

In App Purchase: http://www.sixtemia.com/journal/2009/08/12/using-store-kit-framework/

IP Address: http://www.iphonedevsdk.com/forum/iphone-sdk-development/5293-get-current-ip-address.html

Page Curl Animation: What iPhone OS APIs could I use to implement a transition animation similar to the iBook page flip transition?

TTF Font http://github.com/zynga/FontLabel

Rotate Label: http://iphonedevelopment.blogspot.com/2009/12/better-two-finger-rotate-gesture.html

Speech Recognition - 1: http://cmusphinx.sourceforge.net/

Speech Recognition - 2: http://www.politepix.com/openears/

Operation and Thread: http://www.cimgf.com/2008/02/16/cocoa-tutorial-nsoperation-and-nsoperationqueue/

Web service: http://icodeblog.com/2008/11/03/iphone-programming-tutorial-intro-to-soap-web-services/

Code Analyzer: http://clang.llvm.org/StaticAnalysis.html

Game Center: http://mobile.tutsplus.com/tutorials/iphone/ios-sdk-game-center-achievements-and-leaderboards-part-1/

SMS Chat: https://github.com/acani/AcaniChat

Rotating Knob: https://github.com/hollance/MHRotaryKnob

8) Game Development with Cocos2D:

http://code.google.com/p/cocos2d-iphone/

http://blog.sapusmedia.com/search/label/cocos2d

http://iphonesdkdev.blogspot.com/2009/01/xcode-template-for-cocos2d.html

http://monoclestudios.com/cocos2d_whitepaper.ht

http://lethain.com/entry/2008/oct/03/notes-on-cocos2d-iphone-development/

http://lethain.com/entry/2008/oct/20/touch-detection-in-cocos2d-iphone/

Open GL: http://web.me.com/smaurice/AppleCoder/iPhone_OpenGL/Archive.html

9) Drawing Charts and Graphs

http://code.google.com/p/core-plot/

http://code.google.com/p/s7graphview/

http://github.com/duivesteyn-enterprises/deSimpleChart

http://www.rgraph.net/ (Will work on UIWebView only)

http://sebkade.wordpress.com/2010/05/06/basic-graph-class-for-iphone/ (a blog where demo is given to create a graph)

10) Map Kit

http://github.com/kishikawakatsumi/MapKit-Route-Directions

http://www.iphonedevsdk.com/forum/iphone-sdk-development/8100-opening-maps-app-given-route-direction.html

http://spitzkoff.com/craig/?p=65

11) Audio Streaming

http://code.google.com/p/indie1031/

http://cocoawithlove.com/2010/03/streaming-mp3aac-audio-again.html

http://code.google.com/p/audiostreamer-meta/

http://github.com/DigitalDJ/AudioStreamer

http://lists.apple.com/archives/coreaudio-api/2009/Jan//msg00143.html

https://bitbucket.org/brentsimmons/ngmovieplayer/ (It's a code for streaming video using AVPlayer class. Same code could be applied for streaming audio as well by minor modification)

12) Twitter

http://code.google.com/p/tweetphoto-api-objective-c/

http://tweetphoto-api-objective-c.googlecode.com/files/TweetPhoto.zip

13) Scroll View

http://github.com/andreyvit/ScrollingMadness

http://developer.apple.com/library/ios/#documentation/WindowsViews/Conceptual/UIScrollView_pg/Introduction/Introduction.html

UIScrollView image/photo viewer with paging enabled and zooming

14) SQLite:

http://code.google.com/p/sqlitepersistentobjects/

http://www.slideshare.net/360conferences/using-sqlite

15) Video:

How to play YouTube Movie on an iPhone Application when tapped on UITableViewCell?

http://www.iphonedevsdk.com/forum/iphone-sdk-development/41322-convert-image-sequences-video.html

16) SCM:

http://iphonedevelopment.blogspot.com/2009/03/version-control-is-your-friend.html

http://developer.apple.com/tools/subversionxcode.html

Which SCM system for Xcode?

http://www.covertapps.com/development/6-setting-up-your-xcode-scm-repositories

17) Testing:

Functional Testing: http://www.gorillalogic.com/fonemonkey

Unit Testing: i) http://code.google.com/p/google-toolbox-for-mac/ ii)http://developer.apple.com/tools/unittest.html

Automated Testing: i) http://cocoawithlove.com/2008/11/automated-user-interface-testing-on.html ii)http://code.google.com/p/uispec/ iii) http://answers.oreilly.com/topic/1646-how-to-use-uiautomation-to-create-iphone-ui-tests/

18) Push Notification:

http://blog.boxedice.com/2009/07/10/how-to-build-an-apple-push-notification-provider-server-tutorial/

http://urbanairship.com/

https://developer.apple.com/library/ios/#documentation/NetworkingInternet/Conceptual/RemoteNotificationsPG/

http://osdir.com/ml/cocoa-dev/2010-02/msg00053.html

Configure and Test Push Notification using your Machttp://mobiforge.com/developing/story/programming-apple-push-notification-services

19) Core Data

Tutorial for Beginners http://www.raywenderlich.com/934/core-data-tutorial-getting-started

20) VOIP

http://code.google.com/p/idoubs/

http://code.google.com/p/siphon/

http://github.com/pzion/miumiu

http://www.linphone.org/eng/download/git.html