Editing Doom (1993 video game) (section)

===Ports===
{{main|List of Doom ports|l1=List of ''Doom'' ports}}
[[File:Billdoom.png|thumb|To promote [[Windows 95]], Microsoft CEO [[Bill Gates]] showcased a video presentation while digitally superimposed into ''Doom''.<ref name="BillGates"/>|alt=Screen shot of Bill Gates avatar in a Doom game holding a shotgun]]
In 1995, id created an expanded version of ''Doom'' for the retail market with a fourth episode of levels, which was published by [[GT Interactive]] as ''The Ultimate Doom''.<ref name="UltDoom"/> ''Doom'' has also been ported to numerous different platforms, independent from id Software. The first port of ''Doom'' was an unofficial port to Linux, released by id programmer Dave Taylor in 1994; it was hosted by id but not supported or made official.<ref name="Doomlinux"/> Microsoft attempted to hire id to port ''Doom'' to Windows in 1995 to promote Windows as a gaming platform, and Microsoft CEO [[Bill Gates]] briefly considered buying the company.<ref name="cgw199407"/><ref name="MOD217219"/> When id declined, Microsoft made its own licensed port, with a team led by [[Gabe Newell]].<ref name="windows-95"/> One promotional video for Windows 95 had Gates digitally superimposed into the game.<ref name="BillGates"/>

Other official ports of ''Doom'' were released for the [[32X]] and [[Atari Jaguar]] in 1994, [[SNES]] and [[PlayStation (console)|PlayStation]] in 1995, [[3DO Interactive Multiplayer|3DO]] in 1996, [[Sega Saturn]] in 1997, [[Acorn Computers|Acorn]] [[Risc PC]] in 1998, [[Game Boy Advance]] in 2001, [[Xbox 360]] in 2006, [[iOS]] in 2009, and [[Nintendo Switch]], [[Xbox One]], [[PlayStation 4]], and [[Android (operating system)|Android]] in 2019, with the latter-most platforms (excluding Android) receiving a further expanded port alongside ''[[Doom II]]'' in 2024 along with ports for the [[PlayStation 5]] and [[Xbox Series X/S]].<ref name="IGNDoomVersions"/><ref name="DoomJaguar"/><ref name="DOOM3BFG"/><ref name="2019Ports"/><ref>{{Cite web |last=Lyles |first=Taylor |date=August 8, 2024 |title=DOOM and DOOM 2 Getting New Enhanced Versions With a Brand-New Episode and More |url=https://www.ign.com/articles/doom-and-doom-2-new-enhanced-versions-steam-listing-leaked-quakecon-2024 |access-date=August 8, 2024 |website=IGN |language=en}}</ref><ref>{{Cite web |last=Peters |first=Jay |date=August 8, 2024 |title=Doom and Doom II get a 'definitive' re-release that's packed with upgrades |url=https://www.theverge.com/2024/8/8/24216379/doom-doom-ii-definitive-re-release |access-date=August 8, 2024 |website=[[The Verge]] |language=en}}</ref> Some of these became bestsellers even many years after the initial release.<ref name="PSMags"/> The ports did not all have the same content, with some having fewer levels, such as the 32X port created by John Carmack, which was released with only two-thirds of the game's levels in order to meet the console's launch date, while the PlayStation port includes ''The Ultimate Doom'' and ''Doom II''.<ref name="32XRetro"/><ref name="MAXPSreview"/>

The source code for ''Doom'' was released under a non-commercial license in 1997, and freely released under the [[GNU General Public License]] in 1999.<ref name="DoomSource97"/><ref name="DoomSource99"/> Due to the release of its source code, ''Doom'' has been unofficially ported to numerous platforms. These ports include esoteric devices such as smart thermostats, pianos, and ''Doom'' itself, which led to variations of a long-running [[Internet meme|meme]], "Can it run ''Doom''?" and "It runs ''Doom''".<ref name="ItRunsDoom1"/><ref name="ItRunsDoom2"/><ref name="ItRunsDoom3"/>