Ship Sinking game

http://www.kde.org/applications/games/navalbattle/

Network Construction game

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

Chess board program for KDE

https://apps.kde.org/knights/

High performance authoritative-only DNS server

https://www.knot-dns.cz/

High performance authoritative-only DNS server

https://www.knot-dns.cz/

Miniature Golf

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

Simple ball dodging game

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

KDE paint program

http://www.kolourpaint.org

Conference companion application

https://apps.kde.org/kongress

Galactic Strategy game

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

KDE terminal emulator

https://konsole.kde.org/

KDE glue for embedding KParts into Kontact

https://www.kde.org/

User friendly IRC client for KDE

https://konversation.kde.org

Library for parsing and evaluating OSM opening hours expressions

https://www.kde.org/

Library and QML component for rendering multi-level OSM indoor maps

https://marble.kde.org/

Patience Card game

http://www.kde.org/applications/games/kpatience/

KDE library for PIM-specific text editing utilities

https://www.kde.org/

Library to deal with Apple Wallet pass files

https://www.kde.org/

Access realtime public transport data

MIT implementation of RFC 4120 network authentication service

https://web.mit.edu/kerberos/

MIT implementation of RFC 4120 network authentication service

https://web.mit.edu/kerberos/

MIT implementation of RFC 4120 network authentication service

https://web.mit.edu/kerberos/

Reversi Board game

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

VNC server for KDE

https://www.kde.org

KDE screen ruler

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

Library providing logic to interface scanners

https://invent.kde.org/libraries/ksanecore

Shisen-Sho Mahjongg-like Tile game

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

World Domination Strategy game

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

Job-based library to send email through an SMTP server

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

Snake-like game

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

Space Arcade game

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

Connect the dots to create squares

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

Sudoku game

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

Handy timer for steeping tea

https://www.kde.org/

Xterm variant with Japanese support

https://bogytech.blogspot.jp/search/label/kterm

Various text handling addons

https://invent.kde.org/libraries/ktextaddons/

Countdown launcher for KDE

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

KDE API for the handling of TNEF data

https://www.kde.org/

Picture game for Children

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

Educational programming environment for KDE

https://edu.kde.org/kturtle

3-D game based on Rubik's Cube

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

Password manager for KDE

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

Weather application for Plasma Mobile

https://apps.kde.org/kweather

Library to facilitate retrieval of weather information

https://invent.kde.org/libraries/kweathercore

Flash card trainer for KDE Applications

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

Straightforward implementation of DBM

https://dbmx.net/kyotocabinet/

Testing framework for infrastructure software

https://github.com/jmmv/kyua/

MP4 muxer and other tools

https://l-smash.github.io/l-smash/

Icon pack designed to integrate with most desktop environments

https://krourke.org/projects/art/la-capitaine-icon-theme

Linux Audio Developer's Simple Plugin API

http://www.ladspa.org