GNU Compiler Collection 6

https://gcc.gnu.org

GNU Compiler Collection 7

https://gcc.gnu.org

Create dependencies in makefiles using 'gcc -M'

Gconf database editor for the GNOME 3 environment

Configuration database system for GNOME

http://www.gnome.org/projects/gconf/

GNU copy-in/out (cpio)

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

Library for bits of crypto UI and parsing

https://live.gnome.org/GnomeKeyring

Graphics library for fast creation of images

https://libgd.github.io/

GNU GDB of newer version than comes with the system

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

GNU database manager

https://www.gnu.org.ua/software/gdbm/

Easy to use fast C API for creating charts and graphs

http://www.fred.net/brv/chart/

Graphic library for GTK+

https://developer.gnome.org/gdk-pixbuf/

Components intended to be shared between GNOME development tools

https://www.gnome.org/

Gnome DOM Engine

http://gdome2.cs.unibo.it/

Fast and lightweight GTK+ IDE

https://www.geany.org/

Small but powerful text editor for GNOME 3 Desktop Environment

http://www.gnome.org/projects/gedit/

Plugins for GEdit 3

https://wiki.gnome.org/Apps/Gedit/PluginsLists

Graph based image processing framework

http://gegl.org/

Ukrainian KOI8 fonts for X11R6 (koi8-u)

Gentium Basic and Gentium Book Basic TrueType fonts

https://software.sil.org/gentium/

Gentium Plus TrueType font collection

https://software.sil.org/gentium/

Gtk+ based, file manager inspired by DirectoryOpus

http://www.obsession.se/gentoo/

D-Bus service that provides location information

https://gitlab.freedesktop.org/geoclue/geoclue/wikis/home

Convenience library for the geocoding and reverse geocoding

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

getopt(1) replacement that supports GNU-style long options

http://software.frodo.looijaard.name/getopt/

GNU gettext meta package

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

Check the validity and consistency of PO and POT files

http://gettext-lint.sourceforge.net/

Alter gettext po files in special ways

https://src.fedoraproject.org/rpms/gettext/blob/master/f/msghack.py

GNU gettext runtime libraries and programs

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

GNU gettext development and translation tools

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

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/

GIO bindings not available in gtk-sharp

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

Distributed source code management tool

https://git-scm.com/

Git GUI (Graphical User Interface) components

https://git-scm.com/

Git extension for versioning large files

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

Distributed source code management tool (lite package)

https://git-scm.com/

Compact self-hosted Git service

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

GitHub Enterprise Backup Utilities

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