KDE viewer for CHM files

https://www.kchmviewer.net/

Handy utility to show codepoint information of given characters

https://www.irori.org/tool/kcode.html

KDE application to select colors from the screen or from a palette

https://www.kde.org/applications/graphics/kcolorchooser

Qt-based color picker library with popup menu

https://github.com/ksnip/kColorPicker

KDAB's Dock Widget Framework for Qt

https://www.kdab.com/development-resources/qt-tools/kddockwidgets/

Accessibility applications for KDE

https://apps.kde.org/categories/utilities/

KDE application to enable/disable qCDebug

https://projects.kde.org/projects/kde/kdeutils/kdebugsettings

Support for KDE to interface between your phone and your computer

https://community.kde.org/KDEConnect

Graphics applications for KDE (meta port)

https://apps.kde.org/categories/graphics/

Mobipocket plugins for Strigi indexing and thumbnails

https://invent.kde.org/graphics/kdegraphics-mobipocket

SVG KPart

https://www.kde.org

Thumbnailers for various graphics file formats

https://www.kde.org

FFmpeg-based thumbnail generator for video files

https://www.kde.org/

KDE Filesharing via Samba

Shows free space of devices for KDE

https://utils.kde.org/projects/kdf/

Library to create business diagrams

https://projects.kde.org/kdiagram

Library to create business diagrams

https://projects.kde.org/kdiagram

Show nice dialog boxes from shell scripts

https://kde.org

Three-in-a-row game

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

Program to quiz you on the meanings of Kanji

http://www.bolthole.com/kdrill/

KDAB's helper class for single-instance policy applications

https://github.com/KDAB/KDSingleApplication

C++/Qt SOAP framework

https://github.com/KDAB/KDSoap

Library for finding WS-Discovery devices in the network

https://invent.kde.org/libraries/kdsoap-ws-discovery-client

Alternative DHCP implementation by ISC

https://kea.isc.org/

Bookmark Organizer and Editor

https://kde.org

Light-weight and easy-to-use password manager

https://keepass.info/

KeePass plugin which facilitates the Kee Firefox plugin

https://www.kee.pm/

Serial and network communications package

http://www.kermitproject.org/

Library for registering keyboard shortcuts

https://github.com/engla/keybinder

Library for registering keyboard shortcuts

https://github.com/engla/keybinder

Open Collaboration Services API library

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

KF5 Framework for searching and managing user metadata

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

KF5 workspace and cross-framework integration plugins

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

KF5 runtime and library to organize work in separate activities

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

KF5 statistics for activities

https://api.kde.org/kactivities-stats-index.html

KF5 library that provides classes for handling archive formats

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

KF5 abstraction to system policy and authentication features

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

KF5 library for bookmarks and the XBEL format

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

KDE calendar access library

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

KF5 utilities for working with KCModules

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

KF5 library for string manipulation

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

KF5 text completion helpers and widgets

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

KF5 widgets for configuration dialogs

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

KF5 widgets for configuration dialogs

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

KDE api to manage contact information

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

KF5 addons to QtCore

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

KF5 library to handle crash analysis and bug report from apps

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

DAV protocol implementation with KJobs

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

KF5 addons to QtDBus

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

KF5 library providing integration of QML and KDE Frameworks

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