KDE application to exercise fractions

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

Scientific calculator for KDE

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

Kanji code conversion Filter

Minimal sandboxed CGI library in C

https://kristaps.bsd.lv/kcgi/

Character selector for KDE

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

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/

Support for KDE to interface between your phone and your computer

https://community.kde.org/KDEConnect

Mobipocket plugins for Strigi indexing and thumbnails

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

SVG KPart

https://www.kde.org

FFmpeg-based thumbnail generator for video files

https://www.kde.org/

KDE Filesharing via Samba

Library to create business diagrams

https://projects.kde.org/kdiagram

Library to create business diagrams

https://projects.kde.org/kdiagram

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/

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

https://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 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

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

KF5 addons to QtDBus

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

KF5 extensible daemon for providing system level services

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

KF5 integration of Frameworks widgets in Qt Designer/Creator

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

KF5 integration with su for elevated privileges

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

KF5 abstraction to system DNSSD features

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

KF5 documentation generation from docbook

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

KF5 library to convert emoticons

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

KF5 library to add support for global workspace shortcuts

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