thanks 4 putting source for a noob to learn a little
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DocSets-for-iOS and paid 4 it too https://github.com/omz/DocSets-for-iOS/
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Real Time Congress https://github.com/sunlightlabs/realtimecongress-ios
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Open States app https://github.com/sunlightlabs/StatesLege
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Wikipedia Mobile https://github.com/wikimedia/WikipediaMobile
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Procoding only partial source https://github.com/audiocommander/processing-js
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Card Decks https://github.com/aharren/CardDecks
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Bancha iOS App https://github.com/squallstar/bancha-ios-app
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ioctocat app https://github.com/dennisreimann/ioctocat
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SkeletonKey http://github.com/chrishulbert/SkeletonKey
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Sugar on Pancake https://github.com/Imaginea/pancake-ios
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Salesforce-for-iPad https://github.com/ForceDotComLabs/Salesforce-for-iPad
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iGist not open but gives props many open components.
Some other opensource applications (not sure if all are real/full featured apps) - http://www.iosdevcamp.org/2012/07/26/open-source-apps-at-iosdevcamp-2012/