UITextField subclass with floating labels - inspired by Matt D. Smith's design: http://dribbble.com/shots/1254439--GIF-Mobile-Form-Interaction?list=users

A drop-in universal solution for moving text fields out of the way of the keyboard in iOS

KxMenu is a vertical popup menu for using in iOS applications

Deprecated in favor of PureLayout, which includes OS X support:

FPPopover provides an alternative to the native iOS UIPopoverController, adding support for iPhone and additional opportunities to customize the look and feel of the popovers.

WYPopoverController is for the presentation of content in popover on iPhone / iPad devices. Very customizable.

An iOS implementation of the Snackbar concept, as used extensively in Android as well as some Google iOS apps such as Gmail