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

Khmer OS fonts

https://sourceforge.net/projects/khmer/

KDE pim identities

https://www.kde.org/

Evade killer robots

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

Library for image-annotation tools

https://github.com/ksnip/kImageAnnotator

KDE API for IMAP support

https://www.kde.org/

Plasma6 library to increase the functionality of KIO

https://projects.kde.org/projects/kde/workspace/kio-extras

FUSE Interface for KIO

https://invent.kde.org/system/kio-fuse

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/

802.11 layer2 wireless network detector, sniffer, and IDS

http://www.kismetwireless.net/

Japanese reference/study tool for KDE

https://edu.kde.org/kiten

Data Model and Extraction System for Travel Reservation information

https://www.kde.org/

Territory Capture game

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

LDAP access API for KDE

https://www.kde.org/

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/

KDE Screen magnifier

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

Mahjongg Solitaire

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

KDE library for accessing mail storages in MBox format

https://invent.kde.org/pim/kmbox

Compiler of Keyman KMFL keyboard sources to use with SCIM/IBus

https://kmfl.sourceforge.net/

Library for handling MIME data

https://www.kde.org/

Minesweeper-like game

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

Automatic mouse click tool for KDE

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

Speech synthesizer frontend for KDE

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

Mathematical function plotter for KDE

https://www.kde.org/applications/education/kmplot

Example KMS/GBM/EGL application

https://gitlab.freedesktop.org/mesa/kmscube