The KDE API Reference

3.5.3

• kdecore (classes)
  Core KDE classes that are not related to the user interface.
• kdeui (classes)
  KDE User interface classes such as widgets.
• khtml (classes)
  The KDE HTML component.
• kjs (classes)
  Javascript (aka. ECMAScript and JScript) support.
• kio (classes)
  Low level access to network files. Also provides access to facilities such as KDirWatcher which monitors directories for changes.
• kparts (classes)
  Support for re-usable, embeddable, extendable applications.
• dcop (classes)
  The DCOP communications library.
• kdefx (classes)
  A library with pixmap effects.
• kmdi (classes)
  MultiDocument Interface library.
• libkmid (classes)
  Midi library.
• kdeprint (classes)
  High level printer control functionality.
• interfaces (classes)
  Defines interfaces for common components so that new implementations can be dropped in.
• kabc (classes)
  Access to the KDE address book.
• kresources (classes)
  The KDE resources system.
• kutils (classes)
  High-level utils, like search/replace support.
• arts (classes)
  KDE bindings for arts including knotify.
• knewstuff (classes)
  Upload and download of application data.
• dnssd (classes)
  Network sevices publishing and discovery.
• kunittest (classes)
  Unit testing framework in KDE.

More information about the KDE architecture in form of tutorials, HOWTOs, and FAQs can be found at the KDE Developer's corner.