SerenityOS web browser

https://ladybird.dev/

Fast MP3 encoder kit

http://lame.sourceforge.net/

Library of Fortran 77 subroutines for linear algebra

http://www.netlib.org/lapack/

Standard C language APIs for LAPACK

https://www.netlib.org/lapack/

Tetris-like game for GNUstep

http://www.nongnu.org/gap/lapispuzzle/

Session management system for JACK audio applications

https://www.nongnu.org/lash/

Library for lossless LAS compression

https://laszip.org/

Image viewer and slideshow application

http://gap.nongnu.org/

Support for Japanese text within lstlisting environment

https://sourceforge.jp/projects/mytexpert/

LaTeX service for GNUstep

http://www.roard.com/latexservice/

Sans-serif type family

http://www.latofonts.com

Alternative LAZ implementation for C++ and JavaScript

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

Microsoft .CABinet file creator

http://ohnopub.net/~ohnobinki/lcab/

Light Color Management System -- a color management library

http://www.littlecms.com/

Accurate, fast, and small-footprint color management engine

http://www.littlecms.com/

Linux Test Project GCOV extension

https://ltp.sourceforge.net/coverage/lcov.php

Webfrontend for managing accounts stored in an OpenLDAP server

https://www.ldap-account-manager.org/lamcms/

Maintain DNS zones using an LDAP directory

https://github.com/bklang/ldap2dns

Utility for patching LDAP directories using LDIF files

http://launchpad.net/ldapdiff

LDAP-like embedded database

https://ldb.samba.org/

LDAP-like embedded database

https://ldb.samba.org/

Library for programs conforming to DNS RFCs and drafts

http://www.nlnetlabs.nl/projects/ldns/

LDraw-format CAD files representing many of LEGO bricks produced

https://www.ldraw.org/

LeafRogue for message separated version of Rogue-clone

http://games.roguelife.org/~roguelike/leaf/

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

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/

C library for efficient image processing and image analysis operations

http://www.leptonica.org/

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

Fast and lightweight key/value database library by Google

https://github.com/google/leveldb

Fixed width fonts from the Linux Font Project

Variable width fonts from the Linux Font Project

Shell-like command-line FTP client

https://lftp.tech/

Archive files using LZSS and Huffman compression (.lzh files)

http://www2m.biglobe.ne.jp/~dolphin/lha/lha.htm

Archive files using LZSS and Huffman compression (.lzh files)

http://sourceforge.jp/projects/lha/

Easy to use 2D geometry library in C++

https://gitlab.com/inkscape/lib2geom

Implementation of the 3D Manufacturing Format file standard

http://3mf.io/

The FS library

https://www.x.org/

OpenGL utility library

http://www.freedesktop.org/Software/xorg

Inter Client Exchange library for X11

https://www.freedesktop.org/wiki/Software/xlibs/

Library for creating trees of CORBA IDL files

http://www.gnome.org/

Session Management library for X11

http://www.freedesktop.org/Software/xlibs

X11 library

http://www.freedesktop.org/Software/xlibs

The XScrnSaver library

https://www.freedesktop.org/wiki/Software/xlibs/

Authentication Protocol library for X11

https://www.freedesktop.org/wiki/Software/xlibs/

X Athena Widgets library

https://www.freedesktop.org/wiki/Software/xlibs/

Xaw3d is the X 3D Athena Widget Set

https://www.freedesktop.org/wiki/Software/xlibs/