Japanized ls

Jim Knoble's font package for X

http://www.jmknoble.net/fonts/

MTP device filesystem

https://github.com/kiorky/jmtpfs

Java access to native shared libraries

https://github.com/twall/jna

Joe's Own Editor

https://sourceforge.net/projects/joe-editor/

Dynamic web content management system (CMS)

https://www.joomla.org/

SIMD-accelerated JPEG codec which replaces libjpeg

http://libjpeg-turbo.virtualgl.org/

Lightweight and flexible command-line JSON processor

https://stedolan.github.io/jq/

View and/or control a remote PC

http://jrdesktop.sourceforge.net/

Implementation of Ruby Interpreter in Pure Java

http://jruby.org/

JSON (JavaScript Object Notation) implementation in C

https://github.com/json-c/json-c/wiki

JSON (RFC 4627) interface for Glib

http://live.gnome.org/JsonGlib

JSON reader and writer library for C++

https://github.com/open-source-parsers/jsoncpp

Library to communicate using the JSON-RPC 2.0 specification

https://gitlab.gnome.org/GNOME/jsonrpc-glib

General purpose dynamic array

http://judy.sourceforge.net/

Humanist sans-serif font

https://www.theleagueofmoveabletype.com/junction

Unicode/MUFI OpenType font for medievalists (Latin, IPA, Runic, Greek)

http://junicode.sourceforge.net/

Regression testing utility for use with the Java(TM) Language

http://www.junit.org/

The editor which sucks less

http://www.mirbsd.org/jupp.htm

Japanized Vim-3.0

https://hp.vector.co.jp/authors/VA003457/vim/

Kubernetes command-line tool

https://github.com/derailed/k9s

Makefile framework

http://svn.netlabs.org/kbuild

System to administer web accounts for the KDE desktop

https://projects.kde.org/projects/kdereview/kaccounts-integration

Kanji-Kana Simple Inverter, language filter for Japanese

http://kakasi.namazu.org/

Digital camera manager for KDE

https://www.kde.org

Letter order game for KDE

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

Japanese kana (Hiragana and Katakana) simple flashcard tool

https://kanatest.sourceforge.io/

Pac-Man Clone

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

Free Unicode font for Sinhala script

http://www.kaputa.com/slword/kaputaunicode.htm

Dictionary management tool for anthy

http://kasumi.sourceforge.jp/

Dictionary management tool for anthy-unicode

https://github.com/fujiwarat/kasumi-unicode/

Basic editor framework for the KDE system

https://kate-editor.org/

Sokoban-like Logic game

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

Displays large Japanese letters on the standard output

http://kanji.zinbun.kyoto-u.ac.jp/~yasuoka/program.html

Blackbox Logic game

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

Falling Blocks game

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

Ball Bouncing game

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

Breakout-like game

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

KDE application to exercise fractions

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

Scientific calculator for KDE

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

KDE utility and user interface functions for accessing calendar

https://www.kde.org/

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/