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Aside from the seminal [[Doom games]], the engine has been used for several commercial games:
*[[Heretic]] (1994): A [[wikipedia:Fantasy|fantasy]] themed [[shareware]] game developed by [[Raven Software]] and published by [[id Software]], arranged into three episodes, like [[Doom]]. The engine is based on [[Versions of Doom and Doom II#v1.2|Doom version 1.2]] and adds flying (for the [[player]]), the ability to look up and down, an inventory system allowing the user to select when to use certain [[item]]s and power-ups, and [[monster]]s with multiple ranged attacks.** Heretic: Shadow of the Serpent Riders (1995): An expanded release of Heretic prepared for distribution in retail stores, much like [[The Ultimate Doom]] is in regard to Doom (and likewise free for those with a registered copy of the shareware game), adding two extra episodes plus another three additional (bonus) levels.
*[[Hexen]] (1995): The second fantasy game title by Raven Software published by id Software. It is the sequel to Heretic and the engine is based on Heretic's. It adds character distinct player classes with varying attributes, class-custom weapons with progressive power, a scripting language permitting customized game behavior, and a hub system allowing the player to return to previous levels (instead of as an alternative to the more linear episode system).
**[[Hexen: Deathkings of the Dark Citadel]] (1996): An expansion for use with Hexen providing additional levels, by the same authors, released as a separate product.
*[[Strife]] (1996): A science fiction game developed by [[Rogue Entertainment]] and published by [[VelocityIncorporated|Velocity]]. Its engine is based on [[Versions of Doom and Doom II#v1.666|version 1.666]], or higher, of the Doom engine , and the game includes [[Wikipedia:Non-playing character|NPCs]] the player can interact withand accept missions from, a degree of player character progression, and a particularly non-linear hub system.
*[[Chex Quest]] (1996): A modification of The Ultimate Doom styled after the [[Wikipedia:Chex|Chex Cereal]] brand, developed by [[Wikipedia:Digital Café|Digital Café]] and included in cereal boxes as a promotional bonus item. The game uses an engine based on the source code for The Ultimate Doom, modified to accommodate some necessary changes.
*[[Hacx]] (1997): A full stand-alone modification of [[Doom II]] [[Versions of Doom and Doom II#v1.9|version 1.9]], developed by [[Banjo Software]]. Unlike the games listed above, its developers relied on reverse engineering instead of the source code, although it includes extensive and comprehensive changes to the behavior of [[monster]]s and weapons. Hacx was eventually released as an add-on for Doom II, free of charge.
Additionally, the engine has been [[Commercial games|adapted by various developers]] to run custom versions of the [[Wikipedia:Personal computer|PC]] games, or modifications of them, on various systems and environments, notably gaming consoles.
