GObject library to create cabinet files

https://wiki.gnome.org/msitools

Meta-port for the default version of the GNU Compiler Collection

https://gcc.gnu.org

Eclipse Java Compiler used to build GCC Java

GNU Compiler Collection 10

https://gcc.gnu.org

GNU Compiler Collection 11

https://gcc.gnu.org

GNU Compiler Collection 12

https://gcc.gnu.org

GNU Compiler Collection 13

https://gcc.gnu.org

GNU Compiler Collection 14

https://gcc.gnu.org

GNU Compiler Collection 4.8

https://gcc.gnu.org

GNU Compiler Collection 8

https://gcc.gnu.org

GNU Compiler Collection 9

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/

C++ wrapper for gconf2 API library

http://gtkmm.sourceforge.net/

GNU copy-in/out (cpio)

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

Library for bits of crypto UI and parsing

https://live.gnome.org/GnomeKeyring

Library for bits of crypto UI and parsing

https://live.gnome.org/GnomeKeyring

Graphics library for fast creation of images

https://libgd.github.io/

Translator library for raster geospatial data formats

https://gdal.org/ https://github.com/OSGeo/gdal

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/

Grassroots DICOM library

https://gdcm.sourceforge.net/

Graphic library for GTK+

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

deprecated API for integrating Xlib and GdkPixbuf

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

Components intended to be shared between GNOME development tools

https://www.gnome.org/

GNOME 3 display manager

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

Gnome DOM Engine

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

GDS2 stream file to Postscript and HP/GL converter

Fast and lightweight GTK+ IDE

https://www.geany.org/

SMS / GG emulator

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

Lightweight image viewer forked from GQview

https://www.geeqie.org/

Graph based image processing framework

http://gegl.org/

Ukrainian KOI8 fonts for X11R6 (koi8-u)

Tool for generating a C function which parses command line arguments

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

Standalone genisoimage from cdrkit

http://www.cdrkit.org/

Mkfs equivalent for romfs filesystem

https://github.com/chexum/genromfs

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

Convenience library for the geocoding and reverse geocoding

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

Fetch the latest copies of the GeoIP2 databases

https://github.com/maxmind/geoipupdate

Geometry Engine, Open Source

https://libgeos.org/ https://github.com/libgeos/geos

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/