GObject-based wrapper around Exiv2 library

https://wiki.gnome.org/Projects/gexiv2

GObject library for Facebook Graph API

https://git.gnome.org/browse/libgfbgraph

Commandline flags module for C++

https://github.com/gflags/gflags

The GGZ Gaming Zone - Core Client Libraries

http://www.ggzgamingzone.org/

Ghostscript 8.x PostScript interpreter, base part

https://www.cs.wisc.edu/~ghost/doc/GPL/index.htm

Ghostscript 8.x PostScript interpreter, X11 support

http://www.cs.wisc.edu/~ghost/doc/GPL/index.htm

PostScript and PDF interpreter

https://ghostscript.com/

PostScript and PDF interpreter, X11 support

https://ghostscript.com/

Ghostscript 9.x PostScript interpreter, base part

https://www.cs.wisc.edu/~ghost/doc/GPL/index.htm

Ghostscript 9.x PostScript interpreter, X11 support

https://www.cs.wisc.edu/~ghost/doc/GPL/index.htm

A utility library that includes a wrapper for imlib2

http://www.linuxbrit.co.uk/giblib/

Tools and library routines for working with GIF images

https://sourceforge.net/projects/giflib/

Manipulates GIF images and animations

http://www.lcdf.org/gifsicle/

Frontend to easily manage filesystem connections

https://docs.xfce.org/apps/gigolo/start

GNU Image Manipulation Program

https://www.gimp.org/

GutenPrint Printer Driver

http://gimp-print.sourceforge.net/

C source code reformatter

http://www.gnu.org/software/indent/indent.html

GIO bindings not available in gtk-sharp

http://github.com/mono/gio-sharp

Distributed source code management tool

https://git-scm.com/

Distributed, offline-first bug tracker embedded in git, with bridges

https://github.com/MichaelMure/git-bug

Git extension for versioning large files

https://git-lfs.github.com/

Git "merge" driver for GNU style ChangeLog files

https://www.gnu.org/software/vc-changelog/

Util to keep branches in sync with remotes in git

https://github.com/ctubbsii/git-sync

Assorted git-related scripts and tools

https://github.com/MestreLion/git-tools

Compact self-hosted Git service

https://gitea.io/en-US/

GitHub Enterprise Backup Utilities

https://github.com/github/backup-utils

GNOME Javascript binding

http://live.gnome.org/Gjs

Graphical frontend to su

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

Program to create labels and business cards

http://snaught.com/glabels/

User interface builder for GTK+ 3

https://glade.gnome.org/

Eclipse Jakarta EE Platform

https://projects.eclipse.org/projects/ee4j.glassfish

OpenGL spinning pocket watch demo and benchmark utility

GL Tubing and Extrusion Library

https://linas.org/gle/

OpenGL Extension Wrangler Library

http://glew.sourceforge.net/

Network-related giomodules for glib

Some useful routines of C programming (current stable version)

https://www.gtk.org/

C++ interfaces for glib2

https://www.gtkmm.org/

OpenGL image compositing library

http://freedesktop.org/Software/glitz

C++ mathematics library for software based on the OpenGL GLSL

https://glm.g-truc.net/

Library of C++ classes for flexible logging

https://github.com/google/glog

OpenGL and OpenGL ES shader front end and validator

https://www.khronos.org/opengles/sdk/tools/Reference-Compiler/

GNU version of 'make' utility

https://www.gnu.org/software/make/

Well-known mastermind game

http://gap.nongnu.org/gmastermind/

Library (written in C) for parsing and creating messages using MIME

http://spruce.sourceforge.net/gmime/

Library (written in C) for parsing and creating messages using MIME

http://spruce.sourceforge.net/gmime/

Library (written in C) for parsing and creating messages using MIME

http://spruce.sourceforge.net/gmime/

Library (written in C) for parsing and creating messages using MIME

http://spruce.sourceforge.net/gmime/

Well-known minesweeper game for GNUstep

https://gap.nongnu.org/gmines/

A generic matrix template library

http://home.gna.org/getfem/

Free library for arbitrary precision arithmetic

https://gmplib.org/