PreferencesKit is a framework which provides various features to build
flexible Preferences-like window in any GNUstep or Cocoa applications.
It includes an NSPreferencePane implementation (following Cocoa API).

It is based on GSSystemPreferences code written by Uli Kusterer.

WWW: http://www.dromasoftware.com/etoile/mediawiki/index.php?title=PreferencesKit