simply, would you suggest good sources of open source libraries/components for iOS Objective C projects? I've found a few but it seems they are somewhat elusive and spartan compared with other platforms.
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Raywenderlich.com has recently done a nice little competition for the Top 10 Most Useful iOS Libraries to Know and Love. The libraries listed in the post definitely worth checking out.
In addition to this, if you need a UI component, then Cocoa controls is your place. It has both iOS and OS X components; you can check out the ratings to see which ones our popular and widely used.
CocoaObjects - the Cocoa objects database is a good collection of libraries you could use. There isn't really a commercial market for controls or libraries in the same way that companies like Telerik and Xceed offer for Windows developers.