Open source game developers (O)

O Thiago

Developed game: osu!

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O01eg

Developed games: Citybound, FreeOrion, VCMI

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o11c

Developed games: Land of Fire, The Mana World

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OAO

Developed game: osu!

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Obani Gemini

Developed games: Mighty Knight, Minilens

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Oberlus

Developed game: FreeOrion

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obigu

Developed game: libGDX

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obiwankennedy

Developed game: Rolisteam

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obligaron

Developed game: DevilutionX

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Oblomov

Developed games: Freeminer, Minetest

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Obsidian Plague

Developed game: Freedoom

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ocboogie

Developed game: osu!

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ocean

Developed game: Godot

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Ocelot

Developed game: SuperTux

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Ocelot Mantis

Developed game: Dope Wars

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Ocirne94

Developed game: Speed Dreams

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octareenroon91

Developed game: Space Station 13

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Octav "Narc" Sandulescu

Developed game: Cataclysm: Dark Days Ahead

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odamite

Developed game: Me and My Shadow

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Odd0002

Developed game: SuperTuxKart

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oddbjol

Developed game: Cataclysm: Dark Days Ahead

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Oddzball

Developed game: Cataclysm: Dark Days Ahead

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odgaard

Developed game: osu!

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Oewyn

Developed game: Freestars

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Ofek

Developed game: unitystation

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ofetios

Developed game: Unciv

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Offline

Developed games: Sonic Robo Blast 2, SRB2Kart

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Oheto

Developed game: Unciv

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Ohmyne

Developed game: Paper Isaac

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Oisin100

Developed game: Space Station 13

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Okand37

Developed game: Space Station 13

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okuRaku

Developed game: XMage

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Ola Kruzel

Developed game: Taisei Project

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Ola Sundell

Developed game: FreeCol

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Olaf P

Developed game: Simutrans

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Olaf van der Spek

Developed game: OpenDUNE

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Olanti

Developed game: Cataclysm: Dark Days Ahead

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Olathuss

Developed game: GemRB

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Old T. Man

Developed games: Naev, Nox Imperii

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Oleg

Developed games: OpenMW, TES3MP, Unciv

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Oleg Agafonov

Developed game: XMage

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Oleg Antipin

Developed game: Cataclysm: Dark Days Ahead

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Oleg Baluk

Developed game: COCOS2D-X

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Oleg Derevenetz

Developed game: Free Heroes 2

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Oleg Grenrus

Developed game: LambdaHack

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Oleg Kosmakov

Developed game: Colobot: Gold Edition

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Oleg Ovcharenko

Developed game: Pioneer

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Oleg Tsarev

Developed game: The Battle for Wesnoth

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Oleh Palianytsia

Developed game: libGDX

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Olek Wojnar

Developed game: WorldForge

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Oleksandr Kalko

Developed game: DevilutionX

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Oleksandr Kovalchuk

Developed games: Freeminer, Minetest

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Oleksii Makodzeba

Developed game: Grimsonland

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Oleksii S. Malakhov

Developed game: Cataclysm: Dark Days Ahead

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Oleksiy Slyshyk

Developed game: OpenGoo

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olet-toporkov

Developed game: Torque 2D

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Olexandr Nesterenko

Developed games: A Dark Room, Mindustry, Remixed Dungeon

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OlhaQue

Developed game: Unknown Horizons

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OliBomby

Developed game: osu!

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Oliver Baker

Developed game: TuxKart

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Oliver Brakmann

Developed game: OpenRA

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Oliver Faircliff

Developed game: pycraft

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Oliver Feiler

Developed game: Tornado

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Oliver Frye

Developed game: OpenBlox

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Oliver Gantert

Developed game: Der Clou!

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Oliver JACQ

Developed game: FlightGear

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Oliver Jowett

Developed game: Cataclysm: Dark Days Ahead

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Oliver Jõgar

Developed game: Open Hexagon

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Oliver Schall

Developed game: Ship of Harkinian

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Oliver Schroeder

Developed game: FlightGear

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Oliver Vogel

Developed game: XBlast

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Oliver White

Developed game: WorldForge

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Oliveriver

Developed game: Thrive

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OLiverRttR

Developed game: Return to the Roots

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Olivier

Developed game: 2006scape

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Olivier Abdesselam

Developed games: Chronoshift, CrossUO

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Olivier Biot

Developed games: Clumsy Bird, melonJS

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Olivier Cléro

Developed game: Solarus

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Olivier Dormond

Developed game: The Bub's Brothers

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Olivier Dragon

Developed game: Andor's Trail

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Olivier Grech

Developed games: LIKO-12, OPMon

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Olivier H

Developed game: Danger from the Deep

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Olivier Prat

Developed game: Vircadia

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Olivier Schipper

Developed game: osu!

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Olivier Schmitt

Developed game: FreeCol

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Olivier Wervers

Developed game: OpenRCT2

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Oliwier

Developed game: Beyond All Reason

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Olle Kelderman

Developed game: osu!

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Olli "Hectigo" Etuaho

Developed games: Trip on the Funny Boat, Which Way Is Up?

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Olli Etuaho

Developed games: Beat Harvester, One is enough, Trip on the Funny Boat

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Olli Sorjonen

Developed game: Cat Mother Dead Justice

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Olli-Pekka Valtonen

Developed game: libGDX

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Olof Larsson

Developed game: OpenLieroX

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olonu

Developed game: Stendhal

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Olzaq

Developed game: Arx Libertatis

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omar

Developed game: Dear ImGui

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Omar Aglan

Developed games: Terasology, Unknown Horizons

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Omar Chehab

Developed game: IO Reboot

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Omar Emara

Developed game: UPBGE

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Omar Halbouni

Developed game: boardgame.io

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Omar Polo

Developed game: Godot

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Omar Soriano

Developed game: Galaxy Forces V2

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Omaranwa

Developed games: Terasology, Unknown Horizons

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Omega Heron

Developed game: Vircadia

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OmegaBolt

Developed game: OpenRA

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Omer I.S.

Developed game: SuperTux

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Omer Mor

Developed game: ScummVM

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omero

Developed game: Stendhal

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OmniBlade

Developed games: Chronoshift, Dethrace, Thyme, Vanilla-Conquer

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OmniscientQ

Developed game: OpenXcom

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Ondrej Mosnáček

Developed game: Stockfish

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Ondrej Skopek

Developed game: Hedgewars

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Ondřej Hošek

Developed game: SuperTux

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Ondřej Vajďák

Developed game: osu!

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Ondřej Voves

Developed game: CETech

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OneOfAmorphis

Developed game: nXtank

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OneWingedShark

Developed game: AdaDoom3

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oniatus

Developed games: Destination Sol, Terasology

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OnlineCop

Developed game: KQ Lives

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onpon4

Developed games: Pacewar, ReTux, Tangomon

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Onsemeliot

Developed game: Trigger Rally

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onu

Developed games: Arianne / Marauroa, Stendhal

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onura46

Developed game: Cataclysm: Dark Days Ahead

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oo13

Developed games: Endless Sky, Naev

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ooa113y

Developed game: Ren'Py

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ooshlablu

Developed game: Performous

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ooxi

Developed game: Violetland

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Ope Aina

Developed game: OpenDominion

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Opelkuh

Developed game: osu!

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OpenGOAL Bot

Developed game: OpenGOAL

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openmortaldev

Developed game: OpenMortal

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OpenRCT2 git bot

Developed game: OpenRCT2

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OpenSauce

Developed game: osu!

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opensim-mirror

Developed game: Open Simulator

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Opensource Game Studio

Developed game: OGS Mahjong

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opl-

Developed game: Godot

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oplosthee

Developed game: RuneLite

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opqdonut

Developed game: The Bub's Brothers

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OptimizedForDensity

Developed game: Unciv

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opusforlife2

Developed game: Endless Sky

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orange man

Developed game: Space Station 13

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Orangepeelbeef

Developed game: PCGen

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oranges

Developed game: Space Station 13

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Orangeyness

Developed game: Allegro

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Orazio

Developed game: BOOM: Remake

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Orb370

Developed game: OpenRA

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orblazer

Developed game: Phaser

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Orca

Developed game: Freestars

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Ordo Flammae

Developed game: TripleA

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orefkov

Developed game: Urho3D

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OrekOrek

Developed game: The Battle for Wesnoth

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Oren Hurvitz

Developed games: Open Simulator, Vircadia

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OrenAudeles

Developed game: Cataclysm: Dark Days Ahead

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orengg

Developed game: CCCP

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Orgad Shaneh

Developed game: ScummVM

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Ori Avtalion

Developed games: ResidualVM, ScummVM

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Ori Bar

Developed game: VCMI

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origamiwolf

Developed game: Cataclysm: Dark Days Ahead

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OrionTheFox

Developed game: Space Station 13

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Orlov Valentine

Developed game: Freeminer

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OrnitierPPA

Developed game: 1255 Burgomaster

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Ornok

Developed game: Endless Sky

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ornox

Developed game: Open RSC

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orogor

Developed game: Ecksdee

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OromisElf

Developed game: Cataclysm: Dark Days Ahead

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Oron Peled

Developed game: The Battle for Wesnoth

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Oroty

Developed game: Free Heroes 2

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Ors

Developed game: Sonic Robo Blast 2

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OrsonMaxwell

Developed game: KeeperFX

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Orta Therox

Developed game: Simon Tatham's Portable Puzzle Collection

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orwell96

Developed games: Freeminer, Minetest

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Oscar Linderholm

Developed game: ezQuake

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Oscar Sommerbo

Developed game: Project Porcupine

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oserranoblit

Developed game: halley

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Oskar Niesen

Developed game: Unciv

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Oskar Wallgren

Developed game: Pioneer

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Oskar Wiksten

Developed game: Andor's Trail

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Oskari Heikkinen

Developed game: ET: Legacy

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Osmodium

Developed game: OpenRCT2

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osoitz

Developed games: Andor's Trail, Freeminer, Minetest

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OsoSangre

Developed game: Open Tibia

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OSP

Developed game: Mindustry

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Ospaggi

Developed game: LibreQuake

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OSPx

Developed game: Mindustry

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OTHGMars

Developed game: Torque 3D

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Oto Petrik

Developed game: Dune Legacy

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Ott Tinn

Developed game: Unknown Horizons

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Ott Toomet

Developed game: Marble Marcher

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Ouaz

Developed games: Augustus, FreeOrion, Unciv

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ouned

Developed game: OpenJK

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ousnius

Developed game: REGoth

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Oussama Aouessar

Developed game: Terasology

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outsidePasser

Developed game: Rails: an 18xx game system

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OvenBaker

Developed game: Cataclysm: Dark Days Ahead

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overdhose

Developed game: Terasology

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OvermindDL1

Developed game: Urho3D

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Ovnuniarchos

Developed game: Godot

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Owen

Developed game: Zero-K

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Owen Rudge

Developed game: OpenTTD

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Owen Silva

Developed game: Zero-K

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Owen Young

Developed game: osu!

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owenmpierce

Developed game: Omnispeak

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OWK

Developed game: Freestars

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oy

Developed games: DDraceNetwork, Teeworlds

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Oymate

Developed games: Beat Feet, Pixel Wheels

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oystedal

Developed game: OpenRCT2

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Oystein

Developed game: ScummVM

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oyvindln

Developed games: Me and My Shadow, OpenDungeons

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Ozan Kurt

Developed game: 2Moons Browsergame Engine

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ozan-hifi

Developed game: Vircadia

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Ozkan Sezer

Developed games: Hammer of Thyrion, HHexen, QuakeSpasm, Simple DirectMedia Layer, TyrQuake, vkQuake

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OznOg

Developed game: Performous

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oznogon

Developed game: EmptyEpsilon

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OzoneH3

Developed game: Cataclysm: Dark Days Ahead

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Oğuz Ersen

Developed games: Lexica, Minetest

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Özgür Emir

Developed game: Anuto

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