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/
蓝牙协议栈:http://code.google.com/p/btstack/
语音识别:http://www.politepix.com/openears/
ShareKit:http://www.getsharekit.com/install/
日历控件:http://code.google.com/p/iphonecal/
https://github.com/klazuka/Kal
zlib, openssl:http://code.google.com/p/ios-static-libraries/