Released to the public by the developer after reaching a Patreon goal.[7] The source code for Astral Heroes (one of the games using the engine) was released to patrons.[8]
On December 31, 2021, Jeff Atwood published an updated version of the 101 games included in the original BASIC Computer Games on GitHub under the Unlicense, with permission of David H. Ahl.[10] On June 15, 2022, Ahl formally released everything he had ever written or edited, from prose to software, into the public domain; which includes titles like More BASIC Computer Games and BASIC Computer Adventures.[11][12]
BlitzPlus was released as Open Source on 28 April 2014 under the Zlib license on github.com.[13][14] Blitz3D follow on 3 August 2014.[15][16] BlitzMax was open sourced on 21 September 2015.[17]
Source code for 1997 and 1998 versions released under the MIT License on GitHub on May 3, 2022.[4] The source code for 3D Movie Maker, a computer program using the engine was also released under the same license.
Source code released to the public on February 13, 2002, under a public-domain-equivalent license.[18] The graphics were re-licensed to the CC BY 3.0 license on April 13, 2016.[19]
On 13 January 2016 Microsoft released ChakraCore under the MIT license on GitHub.[26] ChakraCore is essentially the same as the Chakra engine that powers the Microsoft Edge browser, but with platform-agnostic bindings, i.e. without the specific interfaces utilised within the Windows Universal App platform.[27]
Gaijin Entertainment's in-house game engine was quietly released on GitHub under a BSD license in 2023;[39][40] this open-source release will be used as the base for VK's Nau Engine.[41]
DOS.MASTER is a program for Apple II computers which allows Apple DOS 3.3 programs to be placed on a hard drive or 3.5-inch floppy disk and run from ProDOS. Written by Glen Bredon as a commercial program during the late 1980s, it was released into the public domain by his family after the author's death.[43]
On 6 April 2018, Microsoft released binaries and the source code, licensed under the MIT license, for an improved version of File Manager able to be run on Windows 10.[45][46] This version included changes such as the ability to compile in modern versions of Visual Studio, the ability to compile as a 64-bit application, and numerous usability improvements.[46]
Apple Inc. acquired the founding company in March 2015 and discontinued downloads of the software.[48] In April 2018, Apple open-sourced the database and resumed downloads.[49]
After some consultation with the user base, on 12 July 2014 original coder Andy Stone released the Game-Maker 3.0 source code on GitHub, under the MIT license.[50]
After Glitch was officially shut down on 9 December 2012,[56] the artwork and most of the source code was released under the CC0 license on 18 November 2013.[57][58] On 9 December 2014, a fan project to relaunch Glitch under the name Eleven began alpha testing.[59]
Originally released under the LPGL-2.0 license on 25 November 2005,[62] the following year it was re-licensed under the Zlib license.[63] On 7 August 2011, the source code used for the Mac OS X and Linux ports of Hammerfight was also released.[64]
The released version is the source code to Doom. Originally released under a restrictive license on 23 December 1997.[65] The sources for Heretic and Hexen: Beyond Heretic (other two games using the Doom engine) were released under the GPL-2.0-only license.[66] The source code for the Atari Jaguar version of Doom was released under the non-free Doom Source License.[67] The source code for the 3DO Interactive Multiplayer port of Doom was released under the MIT License.[68]
The released version is the source code to Quake. The map sources were also released under the GPL in 2006.[citation needed] In 2000 the source for Hexen II (another game using the id Tech 2 engine) was released under the GPL-2.0-only license.[69]
Jeffrey Lim released the source code to Impulse Tracker as part of its 20th anniversary, with the main source code released on October 19 and sound driver source code released on December 25.
On 13 November 2006, Sun Microsystems released much of Java as free software under the terms of the GPL-2.0-only license. On 8 May 2007 Sun finished the process, making all of Java's core code free and open-source, aside from a small portion of code to which Sun did not hold the copyright.[75]
Open-sourced on December 8, 2022, by ActiveState due to variety of factors, including the deprecation of XUL and XULRunner and the market situation.[77]
Source code released by Wolfire Games upon the success of the original Humble Indie Bundle under the GPL-2.0-or-later license.[78] On November 21, 2016, all of the assets (including those of Lugaru HD) were released under the Creative Commons Attribution-ShareAlike 3.0 Unported license.[79]
Source code for the Simple DirectMedia LayerLinux port by Sam Lantinga released under the GNU GPL v2 on December 7, 1999.[80][81] On April 15, 2010, Andrew Welch and Ian Gilman allowed the assets to be re-licensed under the Creative Commons Attribution 3.0 license.[82]
Developed using the LÖVE framework and originally available under the CC BY-NC-SA 3.0 license, it was relicensed to the MIT license on September 29, 2018.[83]
Originally uploaded by the Computer History Museum in 2014 under a non-commercial license,[86] on 28 September 2018, Microsoft uploaded the source code to GitHub under the MIT license.[87] On April 25, 2024, Microsoft released the source code for MS-DOS 4.0 in collaboration with IBM.[88]
As Linksys built the firmware for their WRT54G wireless router also from GPL'ed code,[104] they were required to make the source code available in July 2003.[105][106]
Source code for the Atari 8-bit port was released by Bill Budge on 12 February 2013 upon the recovery by Electronic Arts of the original floppies containing the source code.[108] On 24 February 2013, the source code for the original Apple II version was released.
First released as open source under the QPL license. Later released under the GPL license. Qt 4.5 and later are released under the LGPL license. Until 2005 the Windows version was only under a proprietary license.
Originally released under the GPL-3.0 license (with an option for a commercial license),[124] the following year it was re-licensed under the MIT license.[125]
Free version released as OpenOffice.org, later released only under the LGPL license. (OpenOffice.org was discontinued in 2011, but forks—most prominently LibreOffice (licensed under the MPL-2.0 license) and Apache OpenOffice (licensed under the Apache-2.0 license)—have become its dominant successors.) StarOffice was still released separately under a proprietary license, using mostly the same code, until its discontinuing in 2011; Sun required all contributors to the main OpenOffice.org project assign joint copyright to Sun.
Originally released under the GPL-3.0 license (with an option for a commercial license),[130] it became proprietary in 2017,[131] and it was re-licensed to the MIT license in 2018.[132]
Source code for the Adobe AIR (Microsoft Windows/Mac OS X) and Flixel (iOS) versions was released on 27 July 2012 on GitHub under the MIT License, the assets were included but were not free.[133] The entire source code repository for the Ouya version was released on 4 February 2021 under the GPL-3.0-only license.[134]
A combination of Torque 2D and iTorque,[135] named Torque 2D MIT, was released under the MIT license by GarageGames.[136] The source code for Larva Mortus, a game using the engine, was released on 1 May 2009 under a non-free non-commercial license.[137]
On December 17, 2021, Two Tribes released the source code to their in-house game engine under the terms of the GPL-2.0-only license (with an option for a proprietary license).[139]
Windows 1.0, released in November 1985, included the first iteration of Windows Calculator. In March 2019, Microsoft released the source code of Windows Calculator under the MIT license.[144]
Source code released upon request under the LGPL-3.0-or-later license with the release of the version 1.8.9.[147] Publicly available under the terms of the MIT license since March 23, 2013.[148] The source code for The White Chamber, a game using the engine, was released on 30 June 2008 under a non-free CC BY-NC-SA 2.0 UK license.[149]
Released by Sun Microsystems under an open-source license in 2005.[155] Due to a FSF announced license incompatibility of the GPL with the CDDL, ZFS wasn't directly integrated in Linux, but in the BSDs or MacOS due to their permissive licensed kernel which offers better license compatibility. After the later owner Oracle didn't release after version 28, the community forked to OpenZFS.[156]
^"C-Dogs". Orc Software. Archived from the original on 2002-02-19. Retrieved 2021-08-23. I've decided to release the C-Dogs source publically [sic]. Do with it what you wish, but please bear in mind that the graphics are still mine.
^congusbongus (2016-05-07). "C-Dogs is now free". C-Dogs SDL. Archived from the original on 2022-02-12. Retrieved 2022-08-26.
^ abcdSparks, Bryan Wayne (2001-10-19). Chaudry, Gabriele "Gaby" (ed.). "License agreement for the CP/M material presented on this site". Lineo, Inc. Archived from the original on 2018-09-08. Retrieved 2018-11-14. […] Let this email represent a right to use, distribute, modify, enhance and otherwise make available in a nonexclusive manner the CP/M technology as part of the "Unofficial CP/M Web Site" with its maintainers, developers and community. I further state that as Chairman and CEO of Lineo, Inc. that I have the right to do offer such a license. […] Bryan Sparks […]{{cite web}}: CS1 maint: bot: original URL status unknown (link)
^ abcdeJemmett, Ben A. L. (April 1999). "Caldera releases GEM under the GPL". Deltasoft - GEM News. Archived from the original on 2016-11-07. Retrieved 2016-11-07. Caldera Thin Clients, Inc. released the source code for GEM and ViewMAX under the GNU Public License in mid April, following years of speculation over GEM's future. Caldera bought the GEM sources from Novell along with the DR-DOS in 1996, at the time noting that they may develop GEM into a platform for mobile computers and thin clients. However, these plans were dropped, and GEM was instead released into the open-source community.
^tinyspeck (2013-11-18). "Glitch is Dead, Long Live Glitch! - Art & Code from the Game Released into Public Domain". glitchthegame.com. Archived from the original on 2013-12-13. Retrieved 2013-12-11. The entire library of art assets from the game, has been made freely available, dedicated to the public domain. Code from the game client is included to help developers work with the assets. All of it can be downloaded and used by anyone, for any purpose.
^"Haaf's Game Engine - Licensing". Relish Games. Archived from the original on 2005-12-12. Retrieved 2021-01-11. Currently HGE goes Open Source. So it is now available under LGPL license. More details to follow.
^"Haaf's Game Engine". Relish Games. Archived from the original on 2016-05-02. 30 August 2006: HGE 1.6 released. Major new features are long awaited Bitmap Font Builder and string tables support. See Version history for detailed change log. HGE is now open source and is distributed under The zlib/libpng License.
^"Hot New Stuff". id Software. 1998-01-04. Archived from the original on 1998-02-04. Retrieved 2020-12-19. Dec 23rd, 1997: John Carmack has released the DOOM Source Code on our ftp site. More information can be found in the readme.
^Plunkett, Luke (2013-04-03). "Lucasarts' Closure Convinces Developers To Release Awesome Star Wars Source Code". Kotaku. Archived from the original on 2013-04-07. Retrieved 2013-04-04. In the wake of Lucasarts' closure today, Raven - the developers of the thoroughly excellent Jedi Outcast - have decided to release the source code for the game. Oh, and the code for its sequel, Jedi Academy, as well.
^Hanselman, Scott; Wilcox, Jeff (2024-04-25). "Open sourcing MS-DOS 4.0". Microsoft Open Source Blog. Microsoft. Archived from the original on 2024-04-25. Retrieved 2024-04-26.
^Stallman, Richard (2000-07-02). "The Problems of the Plan Nine License". Linux Today. Archived from the original on 2021-01-26. Retrieved 2021-05-03. When I saw the announcement that the Plan Nine software had been released as "open source", I wondered whether it might be free software as well. After studying the license, my conclusion was that it is not free [...]. I am not a supporter of the Open Source Movement, but I was glad when one of their leaders told me they don't consider the license acceptable either.
^Sassenrath, Carl (2012-12-12). "Comments on: R3 Source Code Released!". rebol.com. Archived from the original on 2014-08-19. Retrieved 2014-08-14. You probably thought the source release would never happen? Am I right? Well, it's there now in github at github.com/rebol/rebol.
^Miracle, Rob (2019-01-02). "The Corona 2D game engine is going open source in 2019". Corona. Corona Labs. Archived from the original on 2019-01-02. Retrieved 2020-12-07. Corona will be dual-licensed under both commercial and open source licenses. The open source license is the GNU GPLv3 license, and commercial license will be available upon agreement with Corona Labs.
^Miracle, Rob (2020-04-30). "Future of Corona". Corona. Corona Labs. Archived from the original on 2020-05-02. Retrieved 2020-12-07. Pretty much all code related to Corona Labs has been made available under the MIT license.
^Proffitt, Brian (2000-10-13). "StarOffice Code Released in Largest Open Source Project". linuxtoday.com. Archived from the original on 2013-10-16. Retrieved 2013-01-10. Sun's joint effort with CollabNet kicked into high gear on the OpenOffice Web site at 5 a.m. PST this morning with the release of much of the source code for the upcoming 6.0 version of StarOffice. According to Sun, this release of 9 million lines of code under GPL is the beginning of the largest open source software project ever.
^Preisz, Eric (2012-12-12). "Torque 2D MIT Coming Soon". GarageGames. Archived from the original on 2021-04-03. Retrieved 2021-04-15. Torque 2D MIT is an all new, open source, version of our 2D game development software. [...] Take Torque 2D, combine it with iTorque, add in Box 2D physics, several major enhancements and bug fixes, and make it open source. That is Torque 2D MIT.
^readme_iWolf.txt: «I released the original source for Wolfenstein 3D many years ago, originally under a not-for-commercial purposes license, then later under the GPL.»