AFNetworking is a networking library for iOS and Mac OS X. It's built on top of the Foundation URL Loading System, extending the powerful high-level networking abstractions built into Cocoa. It has a modular architecture with well-designed, feature-rich APIs that are a joy to use.

AsyncImageView is an extension of UIImageView for loading and displaying images asynchronously on iOS so that they do not lock up the UI.

To make things as easy as possible, we have several platform SDKs you can import into your development environment to get up and running quickly. The SDKs contain platform-specific libraries that wrap the raw HTTP calls to the Dropbox API. They are designed to shorten the distance between your application and integrating Dropbox.

The Map Kit framework provides an interface for embedding maps directly into your own windows and views. This framework also provides support for annotating the map, adding overlays, and performing reverse-geocoding lookups to determine placemark information for a given map coordinate.

Open source initiative for a universal and persistent UDID solution for iOS.

Open source implementation of Twitter/iPad stacked UI - done right.

Open Source, 100% API compatible replacement of UICollectionView for iOS4.3+.

Utility class for zipping and unzipping files on iOS and Mac.

TouchXML is a lightweight replacement for Cocoa's NSXML* cluster of classes.

ZBar is an open source software suite for reading bar codes from various sources, such as video streams, image files and raw intensity sensors. It supports many popular symbologies (types of bar codes) including EAN-13/UPC-A, UPC-E, EAN-8, Code 128, Code 39, Interleaved 2 of 5 and QR Code. The flexible, layered implementation facilitates bar code scanning and decoding for any application: use it stand-alone with the included GUI and command line programs, easily integrate a bar code scanning widget into your Qt, GTK+ or PyGTK GUI application, leverage one of the script or programming interfaces (Python, Perl, C++) ...all the way down to a streamlined C library suitable for embedded use. ZBar is licensed under the GNU LGPL 2.1 to enable development of both open source and commercial projects.