IPhone开源代码 绝对经典！

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扫描wifi信息：

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

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

条形码扫描：

http://zbar.sourceforge.net/iphone/sdkdoc/install.html

tcp/ip的通讯协议：

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

voip/sip：

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

http://code.google.com/p/asterisk-voicemail-for-iphone/

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

three20

https://github.com/facebook/three20

google gdata

http://code.google.com/p/gdata-objectivec-client/

720全景显示panoramagl

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

jabber client

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

PLBlocks

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

image processing

http://code.google.com/p/simple-iphone-image-processing/

json编码解码: http://code.google.com/p/json-framework

base64编码解码: http://code.google.com/p/google-toolbox-for-mac/source/browse/trunk/Foundation/?r=87

xml解析: https://github.com/schwa/TouchXML

安全保存用户密码到keychain中: https://github.com/ldandersen/scifihifi-iphone

加载等待特效框架(private api): https://github.com/jdg/MBProgressHUD

http等相关协议封装: http://allseeing-i.com/ASIHTTPRequest

下拉刷新 代码 : https://github.com/enormego/EGOTableViewPullRefresh

异步加载 图片 并缓存代码: http://www.markj.net/iphone-asynchronous-table-image/

iphone TTS: https://bitbucket.org/sfoster/iphone-tts

iphone cook book 源码: https://github.com/erica/iphone-3.0-cookbook-
iphone  正则表达式: http://regexkit.sourceforge.net/RegexKitLite/

OAuth认证:   http://code.google.com/p/oauth/
http://code.google.com/p/oauthconsumer/