Homepages: www.galaxy-forces.com, galaxyv2
Inspiration: Gravity Force
Download: galaxyv2/files
Developers: Benny, Omar Soriano, Ronnie Hedlund

Homepages: code.google.com/archive/p/galaxymageredux, groups.google.com/forum/#!forum/galaxymage-redux-dev
Inspiration: GalaxyMage
Developer: Robert Ramsay

Homepages: galaxyng.sourceforge.net, galaxyng
Download: galaxyng/files
Developers: Bogdan Mincu, Chris Shaffer, Frans Slothouber, Geoff Lamperd, Ian Evans, Ken Weinert, Matthew Messana, Paul Heinzlreiter, ref, Steven Webb, Thomas Odaker

Homepages: xriss.github.io/gamecake, cake.4lfa.com/gamecake
Developers: Kriss, shi

Homepage: code.google.com/archive/p/gamekit

Homepage: piepe.lv/game-lv

Homepage: www.gameplay3d.io
Developers: Adam Blake, Andrew Karpushin, bslack, Chris Culy, Christian, David Sauve, Elliot Saba, FunMiles, Ithai Levi, Jim Duchek, Jon Watte, Karim Ahmed, Kensuke Matsuzaki, Kieran Cunney, Marc Plano-Lesay, Marcin Jakubowski, Matt Styles, Michal Srb, Nick Landry, Noel Austin, Ramprasad Madhavan, rcmaniac25, SAUVAGEOT Paul-Arthur, Sean Taylor, Steve Grenier, Üstün Ergenoglu

Homepage: www.ganggarrison.com
Media: Gang Garrison 2
Inspiration: Team Fortress 2
Download: www.ganggarrison.com/downloads.html
Developers: Alexander Nadeau, Andrea, ASBenz, BasedUser, Derpduck, jason, Lennert Claeys, Medo42, Michael Lin, nulldg, PrOF-kk, qoh, router

Homepage: www.thregr.org/~wavexx/software/garith
Inspirations: arithmetic, TuxMath
Developer: Yuri D'Elia

Homepage: gcompris.net/index-en.html
Downloads: gcompris.net/downloads-en.html, f-droid.org//packages/net.gcompris.full

Homepage: bitbucket.org/czirkoszoltan/gdash
Inspiration: Boulder Dash
Download: bitbucket.org/czirkoszoltan/gdash/downloads

Homepage: romlok/godot-gdhexgrid
Developer: Romløk

Homepages: www.gearheadrpg.com, gearhead
Downloads: www.gearheadrpg.com/downloads, gearhead/files/gearhead
Developers: Daemonward, Francisco Muñoz, Joseph Hewitt, jwvhewitt, paulotten

Homepage: www.gearheadrpg.com
Inspiration: GearHead
Downloads: www.gearheadrpg.com/downloads, gearhead2/files/gearhead2
Developers: Francisco Muñoz, Joseph Hewitt, jwvhewitt

Homepage: icculus.org/gwiz
Inspiration: Wizardry
Download: icculus.org/gwiz/download.php

Homepages: www.newbreedsoftware.com/gemdropx, packages.debian.org/search?keywords=gemdropx
Inspiration: Tetris
Download: www.newbreedsoftware.com/gemdropx/download
Developer: Bill Kendrick

Homepage: geshl2.com
Inspiration: GoldenEye 007
Developers: Alan Edwardes, ardneran, Joe Ludwig, Jonas Termansen, Jonathan White, Jørgen P. Tjernø, narendraumate, Neico

Homepage: sandsmark/aicompo-tg17
Inspiration: Pac-Man
Developers: Jo Emil Holen, martin

Homepage: ceva24/gift-grabber
Inspiration: Flag Catcher
Play online: ceva24.github.io/gift-grabber
Developer: Chris Evans

Homepages: gigalomania.sourceforge.net, gigalomania
Inspiration: Mega-Lo-Mania
Developer: Mark

Homepage: sites.google.com/view/gilbert-and-the-doors
Download: drive.google.com/uc?export=download&id=1Qgt-LmuLVRQ5yQ7Lg0QB61eZDoMnLTOl
Developer: Daniel Champagne

Homepage: potomak.github.io/gist-txt/#acebd8fe14942fab4e8e
Developer: Giovanni Cappellotto

Homepage: msharov/gjid
Inspiration: Sokoban
Developer: Mike Sharov

Homepage: Chluverman/android-gltron
Inspiration: GLtron
Download: f-droid.org/de/packages/com.glTron

Homepages: Archive: 20081217023948/http://www.heptargon.de/gl-117/gl-117.html, packages.debian.org/search?keywords=gl-117, gl-117
Download: gl-117/files/gl-117
Developers: A Braunsdorf, Arne Reiners, Bernhard Kaindl, Bilal Ahsan, Cedric Delfosse, Eric Cheung, Eugene Andreeshchev, J-M Le Peuvedic, James Stone, Jean-Marc Le Peuvedic, Lourens Veen, Norbert Drexl, Piotr Pawlow, Thomas Drexl

Homepages: glest.org/en/index.php, glest
Media: Glest
Download: glest.org/en/downloads.php
Developers: enveloop, Jose Zanni, José Zanni, Martiño, Matthias Braun, tucho fernandez

Homepage: globulation2.org/wiki/Main_Page
Media: Globulation 2
Download: globulation2.org/wiki/Download_and_Install

Homepage: mobile.zame-dev.org/gloomy/index.php
Inspirations: Castle Wolfenstein, Doom
Downloads: f-droid.org//packages/zame.GloomyDungeons.opensource.game, f-droid.org/en/packages/org.zamedev.gloomydungeons1hardcore.opensource
Developer: Harry Wood

Homepage: mobile.zame-dev.org/gloomy-ii
Inspirations: Castle Wolfenstein, Doom
Download: f-droid.org//packages/org.zamedev.gloomydungeons2.opensource

Homepages: turulomio/glparchis, glparchis
Inspiration: Parchis
Downloads: Turulomio/glparchis/releases, glparchis/files/glparchis
Developers: Mariano Muñoz, Nadia Adam, Turulomio

Homepage: glportal.de
Inspiration: Portal
Developers: Ahmed Hussein, Aleksey Bykhun, Amir Uqdah, Bowen Yan, Celeste Wouters, Geert Custers, Henry Hirsch, Hermann Rolfes, JulianThijssen, Juraj Oravec, Nilay, PM, Simon Larsen, Stephan Vedder, xantares

Homepage: www.doomworld.com/forum/topic/121500-glspeed-remake-and-expansion-pack-of-the-dos-game-speed-haste-using-id-tech1
Inspiration: Speed Haste
Download: jval1972/Speed#downloads
Developer: jval1972

Homepages: www.gltron.org, gltron
Media: GLtron
Inspiration: Snake
Download: www.gltron.org/download.php
Developers: andi75, Andreas Umbach, Andy Howe, Darrell Walisser, Jonathan Atkins, kkaisershot, Martin Donlon, Nicolas Deniaud, nicolas zimmermann, Nou Phabmixay, Tim Peeler, Todd Kirby

Homepage: KaeruCT/GLXY
Download: f-droid.org/de/packages/com.kaeruct.glxy
Developers: Andrés Villarreal, chsm

Homepage: wiki.gnome.org/Apps/Chess
Download: flathub.org/apps/details/org.gnome.Chess
Developer: Gnome

Homepages: Archive: 20160308075926/http://www.jejik.com/gnome-hearts, packages.ubuntu.com/xenial/gnome-hearts, packages.debian.org/search?keywords=gnome-hearts, launchpad.net/hearts

Homepage: Gnomescroll/Gnomescroll
Inspiration: Minecraft
Developers: A. F. Dudley, corpusc, haltingstate, Steve Leonard

Homepages: www.gnu.org/software/chess, savannah.gnu.org/projects/chess
Media: GNU Chess
Download: ftp.gnu.org/gnu/chess
Developers: Chua Kong Sian, Lukas Geyer, Simon Waters, Stuart Cracraft

Homepages: www.gnu.org/software/freedink, savannah.gnu.org/projects/freedink
Media: GNU FreeDink
Inspiration: Dink Smallwood
Downloads: www.gnu.org/software/freedink/get, ftp.gnu.org/gnu/freedink
Play online: Archive: 20201025225430/https://play.freedink.org
Developer: Sylvain Beucler

Homepages: www.gnu.org/software/gnugo, savannah.gnu.org/projects/gnugo
Media: GNU Go
Download: www.gnu.org/software/gnugo/download.html

Homepage: savannah.gnu.org/projects/gnushogi

Homepages: www.charliedoggames.com/?page_id=62, Archive: 20111013005011/http://www.tweeler.com/index.php?PAGE=goollie_linux
Download: Archive: 20111209123851/http://www.tweeler.com/GoOllie_13.sh
Developer: Tony Oakden

Homepages: www.goblincamp.com, Archive: 20151106001905/https://bitbucket.org/genericcontainer/goblin-camp
Inspirations: Anno 1404, Dungeon Keeper, Dwarf Fortress
Developers: Cat Plus Plus, Dan Smythe, David Humphrey, gencontain, Noel Maersk, rdittrich97, y2s82

Homepage: goblinhack
Download: goblinhack/files
Developers: anatoly techtonik, goblinhack, Neil McGill, paul.radioactive, Richard Franks, Roger Koot

Homepage: dbzer0.com/projects/godot-card-game-framework

Homepages: geshl2.com, www.moddb.com/mods/goldeneye-source
Inspiration: GoldenEye 007
Developers: Alan Edwardes, ardneran, Joe Ludwig, Jonas Termansen, Jonathan White, Jørgen P. Tjernø, narendraumate, Neico

Homepages: golly.sourceforge.net, golly
Inspiration: Game of Life
Downloads: golly/files, play.google.com/store/apps/details?id=net.sf.golly
Developers: Adam P. Goucher, Alan Hensel, Andrew Trevorrow, Brenton Bostick, Chris Rowett, Dave Greene, Jason Summers, Maks Verver, Robert Munafo, Scorbie, tim_hutton, Tomas Rokicki, William R. Buckley

Homepage: jdmclark
Inspiration: Star Wars Jedi Knight: Dark Forces II
Developer: Jonathan Clark

Homepage: gorillas.lyndir.com/index.html
Inspiration: Gorillas
Developer: Maarten Billemont

Homepage: nodef0.github.io/gorillas-rs
Inspiration: Gorillas
Developer: nodef0

Homepage: gottcode.org/gottet
Inspiration: Tetris
Developer: Graeme Gott

Homepages: gav.sourceforge.net, gav
Inspiration: Volleyball
Downloads: gav.sourceforge.net/download.php, gav/files
Developers: alley, Cesare Zavattari, Riccardo Bernardini, Riccardo Vianello, Tim Douglas, Tommaso Schiavinotto

Homepage: leetless.de/tag-Grail.html
Developers: feelydj, Henning Hasemann

Homepage: invent.kde.org/games/granatier
Inspiration: Bomberman

Homepages: hcsoftware.sourceforge.net/gravitation, hcsoftware
Download: hcsoftware/files/Gravitation
Developers: Jason Rohrer, las30

Homepage: evgenyzinoviev/gravitydefied
Download: f-droid.org/de/packages/org.happysanta.gd

Homepages: civilwar.sourceforge.net, civilwar, www.greenius.co.uk/personal/steven/civilwar.html
Inspiration: American Civil War
Developers: Jim Schultz, Steven Green

Homepage: Greentwip/HoneyTown
Inspiration: Story of Seasons series
Developer: Victor Lopez

Homepage: griefly
Inspiration: Space Station 13
Developers: Alexander, crazzymad777, fluorescent-net, Markus Yusuf, mechmind, NinjaDanz3r, shelltitan, Valerii Malov

Homepage: brooklynking.github.io/Grimsonland
Inspiration: Crimsonland
Play online: brooklynking.github.io/Grimsonland
Developer: Oleksii Makodzeba

Homepages: grobots.sourceforge.net, grobots
Developers: Devon Schudy, Hector A Escobedo, Warren Schudy

Homepages: gusanos.sourceforge.net, gusanos
Inspirations: Liero, Worms
Download: gusanos/files
Developers: AK47, basara, darka, Erik Lindroos, JonSully, nymacro, setrodox

Homepages: gustysserpents.sourceforge.net, gustysserpents
Inspiration: Snake
Download: gustysserpents.sourceforge.net/downloads.html
Developers: Alex, Augustin Preda

Homepages: gweled.org, code.launchpad.net/gweled
Inspiration: Bejeweled
Download: gweled.org/download.html
Developers: Daniele Napolitano, Wes Ellis

Homepages: zdoom.org/index, Archive: 20151014204540/http://www.osnanet.de/c.oelckers/gzdoom
Inspirations: Doom, Doom II, Heretic, Hexen
Download: zdoom.org/downloads
Developers: 3saster, Alexander Kromm (m8f), alexey.lysiuk, Alison Watson, Alison Watson (Nightdive Studios), argv-minus-one, arrowgent, Benjamin Moir, Blue-Shadow, Braden Obrzut, Cacodemon345, Chernoskill, Christoph Oelckers, Christopher Bruns, Chronos Ouroboros, Colton G. Rushton, David CARLIER, dondiego, Ed the Bat, Edoardo Prezioso, Edward Richardson (Nightdive Studios), Eevee, Emile Belanger, Erick Tenorio, FishyClockwork, Gaerzi, Gutawer, j-palomo, Jordon Moss, JP LeBreton, K0stov, kcat, Kevin Caccamo, Kyle Evans, Leonard2, Lucy Phipps, Maarten Lensink, Magnus Norddahl, MajorCooke, Marisa Heit, Marisa Kirisame, MaxED, Michael Labbe, mykola-ambar, Nash Muhandes, Nemrtvi, nukeykt, Player701, raa-eruanna, Rachael Alexanderson, SanyaWaffles, Shawn Walker-Salas, Shiny Metagross, Sterling Parker, svdijk, Teemu Piippo, Thomas Hume, vanhofen, Vitaly Novichkov, William Breathitt Gray, Xaser Acheron, yqco, Zain Aamer, ZZYZX