The Qt Cryptographic Architecture (QCA) provides a straightforward and cross-platform API for a range of cryptographic features, including SSL/TLS, X.509 certificates, SASL, OpenPGP, S/MIME CMS, and smart cards.

This library implements the framework for KDE parts, which are widgets with a user-interface defined in terms of actions.

KItemViews includes a set of views, which can be used with item models. It includes views for categorizing lists and to add search filters to flat and hierarchical lists.

This framework implements a lot of file management functions. It supports accessing files locally as well as via HTTP and FTP out of the box and can be extended by plugins to support other protocols as well. There is a variety of plugins available, e.g. to support access via SSH. The framework can also be used to bridge a native protocol to a file-based interface. This makes the data accessible in all applications using the KDE file dialog or any other KIO enabled infrastructure.

Prison is a Qt-based barcode abstraction layer/library and provides uniform access to generation of barcodes with data.

KDESU provides functionality for building GUI front ends for (password asking) console mode programs. kdesu and kdessh use it to interface with su and ssh respectively.

ThreadWeaver is a helper for multithreaded programming. It uses a job-based interface to queue tasks and execute them in an efficient way.

KBookmarks lets you access and manipulate bookmarks stored using the XBEL format.

The KDE GUI addons provide utilities for graphical user interfaces in the areas of colors, fonts, text, images, keyboard input.

ModemManagerQt provides access to all ModemManager features exposed on DBus. It allows you to manage modem devices and access to information available for your modem devices, like signal, location and messages.

KPlotWidget is a QWidget-derived class that provides a virtual base class for easy data-plotting. The idea behind KPlotWidget is that you only have to specify information in "data units", the natural units of the data being plotted. KPlotWidget automatically converts everything to screen pixel units.

KXMLGUI provides a framework for managing menu and toolbar actions in an abstract way. The actions are configured through a XML description and hooks in the application code. The framework supports merging of multiple descriptions for integrating actions from plugins.

KWindowSystem provides information about and allows interaction with the windowing system. It provides a high level API, which is windowing system independent and has platform specific implementations. This API is inspired by X11 and thus not all functionality is available on all windowing systems.

In addition to the high level API, this framework also provides several lower level classes for interaction with the X Windowing System.

KActivities provides the infrastructure needed to manage a user's activities, allowing them to switch between tasks, and for applications to update their state to match the user's current activity. This includes a daemon, a library for interacting with that daemon, and plugins for integration with other frameworks.

KNotification is used to notify the user of an event. It covers feedback and persistent events.

This is a stand-alone implementation of the Kate syntax highlighting engine. It's meant as a building block for text editors as well as for simple highlighted text rendering (e.g. as HTML), supporting both integration with a custom editor as well as a ready-to-use QSyntaxHighlighter sub-class.

The KNewStuff library implements collaborative data sharing for applications. It uses libattica to support the Open Collaboration Services specification.

This library provides text addons (autocorrection, text to speak, grammar checking, text translator, emoticon support) for Qt applications.

KConfigWidgets provides easy-to-use classes to create configuration dialogs, as well as a set of widgets which uses KConfig to store their settings.

KNotification is used to notify the user of an event. It covers feedback and persistent events.

This library provides access to and handling of calendar data. It supports the standard formats iCalendar and vCalendar and the group scheduling standard iTIP.

A calendar contains information like incidences (events, to-dos, journals), alarms, time zones, and other useful information. This API provides access to that calendar information via well known calendar formats iCalendar (or iCal) and the older vCalendar.

KCrash provides support for intercepting and handling application crashes.

KDED stands for KDE Daemon. KDED runs in the background and performs a number of small tasks. Some of these tasks are built in, others are started on demand.

KDeclarative provides integration of QML and KDE work spaces. It's comprises two parts: a library used by the C++ part of your application to integrate QML with KDE Frameworks specific features, and a series of QML imports that offer bindings to some of the Frameworks.