DMX extension library

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

Simple interface to low level networking routines

https://github.com/5u623l20/libdnet/

Standard library for Window Maker dock apps

http://solfertje.student.utwente.nl/~dalroi/libdockapp/

Userspace interface to kernel Direct Rendering Module services

https://dri.freedesktop.org/

Alsa compatibility library to build DSSI

http://www.smbolton.com/linux.html

Quasar DV codec (libdv): software codec for DV video encoding format

http://libdv.sourceforge.net/

Portable abstraction library for DVD decryption

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

Videolan version of the libdvdnav project

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

MPlayer version of the libdvdread project

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

Command line editor library

http://thrysoee.dk/editline/

Enhanced Metafile Library

http://libemf.sourceforge.net/

Small epoll implementation using kqueue

https://github.com/jiixyj/epoll-shim

Library to handle OpenGL function pointer management

https://github.com/anholt/libepoxy

Library for generating documents in ePub format

http://libepubgen.sourceforge.net/

Liberation fonts from Red Hat to replace MS TTF fonts

https://github.com/liberationfonts/liberation-fonts

Full-featured and high-performance event loop library

http://software.schmorp.de/pkg/libev.html

Linux Event Device library

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

API for executing callback functions on events or timeouts

https://libevent.org/

Library for inspecting program's backtrace

http://www.gnu.org/software/libc/manual/html_node/Backtraces.html

Library to read digital camera file meta-data

https://libexif.github.io/

Application library for the Xfce desktop environment

https://www.xfce.org/

Video encoding library

http://fame.sourceforge.net/

Foreign Function Interface

https://sourceware.org/libffi/

The fontenc Library

https://www.x.org/

Library routines for working with Flashpix images

https://www.i3a.org/

General purpose crypto library based on code used in GnuPG

https://www.gnupg.org/software/libgcrypt/index.html

Provides uniform access to different kinds of data sources

https://www.gnome-db.org/

Provides Berkeley DB backend for the libgda5 library

https://www.gnome-db.org/

Provides Java DB Connector backend for the libgda5 library

https://www.gnome-db.org/

Provides ldap access for the libgda5 library

https://www.gnome-db.org/

Provides mdb backend for the libgda5 library

https://www.gnome-db.org/

Provides mysql backend for the libgda5 library

https://www.gnome-db.org/

Provides postgresql access for the libgda5 library

https://www.gnome-db.org/

The libgda 5 ui library

https://www.gnome-db.org/

GLib based implimentation of the GData protocol

http://live.gnome.org/libgdata

GDI+ API for System.Windows.Forms in Mono

https://www.mono-project.com/docs/gui/libgdiplus/

GObject collection library

https://wiki.gnome.org/Projects/Libgee

GObject based library for handling and rendering epub documents

https://gitlab.gnome.org/GNOME/libgepub

The GGZ Gaming Zone - Base Library

http://www.ggzgamingzone.org/

Gigasampler file loader library

http://www.linuxsampler.org/

Portable, pure C implementation of the Git core

https://libgit2.github.com/

Glib wrapper library around the libgit2 git access library

https://git.gnome.org/browse/libgit2-glib

Library providing su and sudo functionality

http://www.gnu.org/non-gnu/gksu/

GNOME glade library

Collection of video game music emulators

https://bitbucket.org/mpyne/game-music-emu

Libraries for GNOME, a GNU desktop environment

http://www.gnome.org/

Small library intended for internal use by GNOME Games

https://git.gnome.org/browse/libgnome-games-support

Program that keeps passwords and other secrets

Graphics library for GNOME

Support library for gnome cups admistration

http://www.gnome.org/