Provides library functionality for FIDO 2.0

https://developers.yubico.com/libfido2/

C++ library for building platform-independent programs

https://lib.filezilla-project.org/

Core library of PCManFM file manager

https://wiki.lxde.org/en/Libfm

LibFM-Extra library

https://wiki.lxde.org/en/Libfm

Formatting library for C++

https://fmt.dev/

The fontenc Library

https://www.x.org/

Library for fingerprint reader devices

https://fprint.freedesktop.org/

Library routines for working with Flashpix images

https://www.i3a.org/

Library and tools to access the Apple File System (APFS)

https://github.com/libyal/libfsapfs

Library and tools to access the Extended File System

https://github.com/libyal/libfsext

Library and tools to access the File Allocation Table File System

https://github.com/libyal/libfsfat

Library and tools to access the Mac OS Hierarchical File System (HFS)

https://github.com/libyal/libfshfs

Library and tools to access the New Technology File System (NTFS)

https://github.com/libyal/libfsntfs

Library and tools to access the SGI X File System

https://github.com/libyal/libfsxfs

Library (using libusb) to talk to FTDI chips

http://www.intra2net.com/de/produkte/opensource/ftdi/

Library for Windows NT data types

https://github.com/libyal/libfwnt

YAML parser and emitter

https://github.com/pantoniou/libfyaml

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 postgresql access for the libgda5 library

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

The libgda 5 ui library

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

Database access library

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

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/

File loading and saving for Gedit

https://gitlab.gnome.org/World/gedit/libgedit-gfls

Extend GtkTextView source code editing widget

https://gitlab.gnome.org/World/gedit/libgedit-gtksourceview

GObject collection library

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

Library for reading and writing GeoTIFF information tags

https://github.com/OSGeo/libgeotiff

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

GL Vendor-Neutral Dispatch library

https://gitlab.freedesktop.org/glvnd/libglvnd

Collection of video game music emulators

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

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

GNOME keyboard shared library

Toolkit based on glib and ncurses for text-mode user interfaces

https://keep.imfreedom.org/libgnt/libgnt/

GNU Regex Library

http://www.gnu.org/software/gnulib/

Common error values for all GnuPG components

https://www.gnupg.org/software/libgpg-error/

Universal digital camera control library

http://www.gphoto.org/proj/libgphoto2/

Library for direct access to iPod/iPhone contents

http://www.gtkpod.org/wiki/Libgpod

Library for easy management of RSS/Atom/Pie feeds

http://www.gnome.org/