Reporting of idle time of user and system

https://api.kde.org/kidletime-index.html

Plugins to allow QImage to support extra file formats

https://api.kde.org/kimageformats-index.html

Network transparent access to files and data

https://api.kde.org/kio-index.html

QtQuick components for building adaptable UIs

https://api.kde.org/kirigami-index.html

Set of item models extending the Qt model-view framework

https://api.kde.org/kitemmodels-index.html

Set of item views extending the Qt model-view framework

https://api.kde.org/kitemviews-index.html

Widgets for showing progress of asynchronous jobs

https://api.kde.org/kjobwidgets-index.html

Framework for downloading and sharing additional application data

https://api.kde.org/knewstuff-index.html

Cross-platform library for creating popup notifications

https://api.kde.org/knotifications-index.html

Configuration system for KNotify

https://api.kde.org/knotifyconfig-index.html

Installation and loading of additional content as packages

https://api.kde.org/kpackage-index.html

Plugin framework for user interface components

https://api.kde.org/kparts-index.html

Provides access to all contacts and aggregates them by person

https://api.kde.org/kpeople-index.html

Provides a virtual base class for easy data-plotting

https://api.kde.org/kplotting-index.html

Interfacing with pseudo terminal devices

https://api.kde.org/kpty-index.html

QtQuick module providing high-performance charts

https://api.kde.org/kquickcharts-index.html

Framework for providing different actions given a string query

https://api.kde.org/krunner-index.html

Plugin framework for desktop services

https://api.kde.org/kservice-index.html

Implementation of Status Notifier Items

https://api.kde.org/kstatusnotifieritem-index.html

Components for handling SVGs

https://api.kde.org/ksvg-index.html

Full text editor component

https://api.kde.org/ktexteditor-index.html

Library to separate the structure of documents from the data

https://api.kde.org/ktexttemplate-index.html

Text editing widgets

https://api.kde.org/ktextwidgets-index.html

Converting physical units

https://api.kde.org/kunitconversion-index.html

Framework for collecting feedback from application users

https://api.kde.org/kuserfeedback-index.html

Safe desktop-wide storage for passwords

https://api.kde.org/kwallet-index.html

Large set of desktop widgets

https://api.kde.org/kwidgetsaddons-index.html

Access to the windowing system

https://api.kde.org/frameworks/kwindowsystem/html/index.html

Framework for managing menu and toolbar actions

https://api.kde.org/kxmlgui-index.html

Qt-based barcode abstraction layer/library

https://api.kde.org/prison-index.html

Offers available actions for a specific purpose

https://api.kde.org/purpose-index.html

Style for Qt Quick Controls 2

https://api.kde.org/qqc2-desktop-style-index.html

Desktop hardware abstraction

https://api.kde.org/solid-index.html

Multi-language spell checker

https://api.kde.org/sonnet-index.html

Parser library for RSS and Atom feeds

https://api.kde.org/syndication-index.html

Syntax highlighting engine for Kate syntax definitions

https://api.kde.org/syntax-highlighting-index.html

Helper for multithreaded programming

https://api.kde.org/threadweaver-index.html

Find files and folders

https://www.kde.org/applications/utilities/kfind/

Four-in-a-row Board game

https://www.kde.org/applications/games/kfourinline/

KDE geography trainer

https://edu.kde.org/kgeography

Evade killer robots

https://www.kde.org/applications/games/killbots/

Additional set of visual components for Kirigami framework

https://invent.kde.org/libraries/kirigami-addons

Yahtzee-like Dice game

https://www.kde.org/applications/games/kiriki/

Japanese reference/study tool for KDE

https://edu.kde.org/kiten

Territory Capture game

https://www.kde.org/applications/games/kjumpingcube/

Alphabet learning tool for KDE

https://edu.kde.org/klettres

Tetris themed solitaire

https://www.kde.org/applications/games/

Tactical game

https://www.kde.org/applications/games/klines/

Mahjongg Solitaire

https://www.kde.org/applications/games/kmahjongg/

Minesweeper-like game

https://www.kde.org/applications/games/kmines/