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/

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/

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

802.11 layer2 wireless network detector, sniffer, and IDS

http://www.kismetwireless.net/

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

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

http://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/

Example KMS/GBM/EGL application

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

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/

Galactic Strategy game

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

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/

Patience Card game

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

Library to deal with Apple Wallet pass files

https://www.kde.org/

Authentication system developed at MIT, successor to Kerberos IV

http://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/

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/

Xterm variant with Japanese support

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