Cocoa Controls is a website which offers this functionality to iOS and Mac OS X developers by listing open source and custom UI components for these platforms.
When creating a web application or a software, it is usually a good idea to search for resources, like snippets, plugins, etc., that can ease the job.
There are already 150+ controls (like this awesome iCarousel) where new ones are added regularly. Also, you can submit new resources as well.
Top-Rated iOS Controls
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A subclass of UIButton that provides imageless gradients. Drop-in compatible with any project.
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This project gives you a drop-in PIN code entry screen that looks like the entry screen seen in S…
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iOS UITableViewCell that automatically adjusts its height as you enter text.
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Add drag and drop reordering to a UITableView.
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Alert overlays that can contain text and images.
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A gorgeous graphing view.
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A Coverflow replacement built entirely with public APIs!
P.S. What would be greater is a categorization of the controls so they can be found much easier.