Cocoa Frameworks
User Interface
MIT License
Provides additional layout and style behavior of user interface.
BSD License
Plugin for Interface Builder 3, contains commonly used UI elements and other useful objects. You can just drag and drop in IB3! Preference Windows, Transparent Controls, Mail Style Button Bar, Bottom Bars, and more.
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Cocoa Control for HUD window. Plugin for Interface Builder 3.
BSD License
HUD style TableView, OutlineView, progress and more HUD cocoa controls.
BSD License
Rich set of HUD cocoa controls. Feature: all controls are drawn using code, not images. Hence it's resolution independent and less heavy in size.
New BSD License
Safari-liked tabs implementation with NSTabView. Source code currently hosted in http://code.google.com/p/maccode/.
Credit Author And Free To Use
Some UI classes like KBPopUpToolbarItem, iPopUpButton, KBLinedTextView and more.
Modern Application Feature
Apache License 2.0
Software auto updater for nearly every kind of file: Cocoa apps, screen saver, preference panes, kext, regular files and root-owned applications.
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Software auto updater. Support bundles, pref panes, plugins or other non-.app software since 1.5.
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A user can paste content from any LinkBack-enabled application into another and reopen that content later for editing with just a double-click. Changes will automatically appear in the original document again when you save.
Fundamental
John Engelhart
BSD License
Regular expression using PCRE library. RegexKit Lite use ICU engine shipped with Mac OS X.
BSD License
Regular expression using Oniguruma library. Lack of English document.
Graphics
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Cocoa vector graphics framework. Bezier path editor, gradient, background, text along the path, ...
Network
MIT License
Map port using UPNP and Nat-PMP. Enable your app to be reachable from the Internet even in a home networking setup.
New BSD License
ObjectiveFlickr is an Objective-C framework that makes it easy for a Cocoa application to work with the Flickr API. LFHTTPRequest in this framework is a very useful class to deal with HTTP request.