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GNU General Public License, version 2.0

GNU General Public License, version 2.0

45 frameworks

AraMorph

Kind: morphological analysis engine
Latest version: 1.2.1
Licence: GNU General Public License, version 2.0

BareDOOM

Kind: source port
Based on: Barebox
Licence: GNU General Public License, version 2.0

CNQ3

Kind: game engine, source port
Implemented in: C++
Based on: Id Tech 3, Ioquake3

CoreDOOM

Kind: source port
Based on: Doomgeneric
Licence: GNU General Public License, version 2.0

Daedalus

Kind: game engine
Latest version: 3.5 (November 8, 2024)
Licence: GNU General Public License, version 2.0

DokuWiki

Kind: wiki software
Implemented in: PHP
Appeared: 2004

Doom8088

Kind: source port
Based on: GBADoom
Licence: GNU General Public License, version 2.0

Doomgeneric

Kind: source port
Based on: FbDOOM
Licence: GNU General Public License, version 2.0

EDuke32

Kind: free software, source port
Appeared: 2004
First release: 2004

EV3DOOM

Kind: source port
Based on: Doomgeneric
Latest version: 1.1 (November 16, 2023)

Federated Wiki

Kind: free and open-source software, wiki software, JavaScript library
Implemented in: CoffeeScript, JavaScript
Appeared: 2011

Foswiki

Kind: wiki software
Implemented in: Unix shell, JavaScript, Perl
Appeared: 2009

FreeCNC

Kind: game engine recreation
Based on: Command & Conquer
Licence: GNU General Public License, version 2.0

FusionForge

Kind: issue tracking system, forge, free software, wiki software
Implemented in: JavaScript, PHP
Appeared: 2009

GemRB

Kind: game engine
Implemented in: C++, Python
Based on: Infinity Engine

Hiki

Kind: free software, wiki software
Implemented in: Ruby
Latest version: 1.0.0 (March 29, 2013)

International Doom

Kind: source port
Based on: Chocolate Doom, Crispy Doom
Latest version: 7.3 (December 31, 2023)

Ioquake3

Kind: game engine, free software, source port
Implemented in: C
Based on: Id Tech 3

Kopi

Kind: GNU package, free software, application framework
Implemented in: Java
Latest version: 2.3B (September 17, 2007)

Managed Doom

Kind: source port
Implemented in: C#
Based on: Linux Doom

Netfilter

Kind: open-source project
Implemented in: C
Licence: GNU General Public License, version 2.0

Nugget Doom

Kind: source port
Based on: Woof!
Latest version: 6.1.0 (October 18, 2026)

OpenMoHAA

Kind: game engine recreation
Latest version: 0.82.1 (August 3, 2025)
Licence: GNU General Public License, version 2.0

Ovidentia

Kind: content management system, free software, content management framework
Implemented in: PHP
Licence: GNU General Public License, version 2.0

PhpWiki

Kind: wiki software
Implemented in: PHP
Licence: GNU General Public License, version 2.0

PikiPiki

Kind: free and open-source software, wiki software
Implemented in: Python
Licence: GNU General Public License, version 2.0

Plone

Kind: content management system, web framework, free software
Implemented in: Python
Latest version: 6.2.2 (September 10, 2026)

PsDooM

Kind: free software, source port
Developer: Dennis L Chao
Based on: XDoom

Qt

Kind: widget toolkit, software library, computing platform, free software, application framework
Implemented in: C++
Appeared: 1995

QuakeSpasm

Kind: game engine, source port
Based on: FitzQuake
Licence: GNU General Public License, version 2.0

Redmine

Kind: issue tracking system, project management software, source code repository, free software, wiki software, bug tracking system
Implemented in: Ruby
Appeared: 2006

Retribution Engine

Kind: game engine
Implemented in: C++
Latest version: 1.13 (April 14, 2016)

Screwturn Wiki

Kind: wiki software
Implemented in: C#
Latest version: 5.2.0.7 (December 13, 2015)

Serious Engine

Kind: game engine version
Implemented in: C++
Appeared: 2001

Step

Kind: application software, free and open-source software, physics engine
Implemented in: C++
Latest version: 23.04.3 (July 6, 2023)

Stratagus

Kind: game engine recreation, free software
Implemented in: C++
Latest version: 3.3.2 (August 10, 2022)

TamTam

Kind: free software, wiki software
Developer: Marcell Mars, Aleksandar Erkalović
Based on: MoinMoin

The Force Engine

Kind: game engine recreation
Based on: Jedi
Latest version: 1.22.420 (September 10, 2025)

Transcode

Kind: multimedia framework, free software
Implemented in: C
Latest version: 1.1.7 (November 19, 2011)

Vanilla JS

Implemented in: JavaScript
Licence: GNU General Public License, version 2.0

VCMI

Kind: game engine, free software, source port, video game
Appeared: 2007
Based on: Heroes of Might and Magic III

Woof!

Kind: source port
Based on: WinMBF
Latest version: 16.0.0 (September 8, 2026)

WorldForge

Kind: game engine, free software
Implemented in: C++
Appeared: 1998

Xconq

Kind: game engine, video game
Implemented in: C, C++
Appeared: 1986

ZDoom

Kind: free software, source port
Based on: ATB Doom, Linux Doom
Latest version: 2.8.1 (February 22, 2016)