A website that people creating controls for the iOS can share as Open Source libraries. Those Custom UI Component Database for iOS and Mac OS X are now at your finger tips to create more exciting applications

You can find the controls here http://cocoacontrols.com/platforms/ios/controls

My favorites :

WhirlyGlobe

WhirlyGlobe is an interactive 3D globe toolkit for ios. It handles the rendering and data manipulation side and strives to maintain a constant frame rate. It's pretty and it's quite good. It can be used to display a few data points on the earth or as a center piece for an earth based app.

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Basic PDF Reader/Viewer for iOS

Basic PDF reader/viewer code for iOS developers struggling with wrangling PDF files onto iOS device screens.

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ToolDrawer

A collapsible toolbar that is affixed to one of the four corners of the screen.

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DCRoundSwitch

DCRoundSwitch is designed to be a drop in replacement for UISwitch. It is styled 'modern' so will unify the look of your apps into the future whilst retaining backwards capability. Drawing is done in CoreGraphics so no images are required.

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MKTickerView

MKTickerView is a drop-in replacement for a horizontal stock ticker kind-of control. Infinite scrolling, and wraps around automatically when the last item is hit. Butter smooth scrolling.

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Pie Menu

A pie menu implementation specially designed for iPhone and iPod touch

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BulbView

Cocoa/UIKit view to display text like light-up bulbs on a sports scoreboard.

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MeterView

Dashboard-style gauges for iOS.

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MRMapView

An iOS library for displaying tiled maps with support for custom tile providers.

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AcaniChat

An open-source version of iPhone's native Messages app.

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CoolButtons

CoolButtons is a subclass of UIButton that draws glassy iOS style buttons, all using CoreGraphics and no images.

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iOSPlot

Draw line charts and pie charts in iOS.

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