Lightweight and flexible command-line JSON processor

https://jqlang.github.io/jq/

JSON reader and writer library for C++

http://jsoncpp.sourceforge.net/

Humanist sans-serif font

https://www.theleagueofmoveabletype.com/junction

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

http://www.junit.org/

GUI control software for the stock K40 laser cutter controller

https://www.scorchworks.com/K40whisperer/k40whisperer.html

Kubernetes command-line tool

https://github.com/derailed/k9s

Dictionary management tool for anthy

http://kasumi.sourceforge.jp/

Dictionary management tool for anthy-unicode

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

Qt-based color picker library with popup menu

https://github.com/ksnip/kColorPicker

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 registering keyboard shortcuts

https://github.com/engla/keybinder

Library for registering keyboard shortcuts

https://github.com/engla/keybinder

High performance authoritative-only DNS server

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

High performance authoritative-only DNS server

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

AT&T KornShell ksh93u+ 2012-08-01 (stable) version

http://www.kornshell.com/

Development branch of AT&T KornShell 93

http://www.kornshell.com/

Testing framework for infrastructure software

https://github.com/freebsd/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

Library for lossless LAS compression

https://laszip.org/

Sans-serif type family

http://www.latofonts.com

Alternative LAZ implementation for C++ and JavaScript

https://github.com/hobu/laz-perf

Accurate, fast, and small-footprint color management engine

http://www.littlecms.com/

LDAP-like embedded database

https://ldb.samba.org/

LDraw-format CAD files representing many of LEGO bricks produced

https://www.ldraw.org/

Revival of an old classic, Alternate Gothic #1

https://www.theleagueofmoveabletype.com/league-gothic

Revival of ATF\x27s classic Spartan

https://www.theleagueofmoveabletype.com/league-spartan

Hybrid Context Optimizer: MCP Server, reduces LLM token consumption

https://leanctx.com https://github.com/yvgude/lean-ctx

LALR(1) parser generator. Similar in function to yacc and bison

http://www.hwaci.com/sw/lemon/

CAD program for creating virtual LEGO models

https://www.leocad.org/ https://github.com/leozide/leocad/

S3-compatible object storage server backed by a POSIX filesystem

https://github.com/MidnightBSD/leonardo

C++ library for Limited Error Raster Compression

https://esri.github.io/lerc/

Better pager utility

http://www.greenwoodsoftware.com/less/

oneAPI Level Zero Specification Headers and Loader

https://spec.oneapi.io/versions/latest/elements/l0/source/index.html https://github.com/oneapi-src/level-zero

Implementation of the 3D Manufacturing Format file standard

http://3mf.io/

Library for creating trees of CORBA IDL files

http://www.gnome.org/

Free library for decoding ATSC A/52 streams, aka AC-3

http://liba52.sourceforge.net/

Advanced Access Content System implementation

https://www.videolan.org/developers/libaacs.html

Library providing ability to interpret Abiword documents

https://wiki.documentfoundation.org/DLP/Libraries/libabw

Qt5 wrapper for SSO framework

https://gitlab.com/accounts-sso

WHATWG-compliant and fast URL parser

https://ada-url.com/

Adaptive entropy coding library

https://gitlab.dkrz.de/k202009/libaec https://github.com/MathisRosenhauer/libaec

Portable audio output library

https://www.xiph.org/ao/

Library to create and read several streaming archive formats

http://libarchive.googlecode.com/

Communication library between internal components for Ultimaker

https://github.com/Ultimaker/libArcus

Memory hard password hashing program and library

https://github.com/P-H-C/phc-winner-argon2

Atomic operations access library

http://www.hboehm.info/gc/

Sound library for SGI audio file

http://www.68k.org/~michael/audiofile/

C library providing BLAKE2b, BLAKE2s, BLAKE2bp, BLAKE2sp

https://blake2.net/