List of DRM-free games/Patchable games

Title	Win	Mac	Lin	Remark
Chantelise - A Tale of Two Sisters	✔	n/a	n/a	Official website of Carpe Fulgur
Deus Ex: Game of the Year Edition	✔	n/a	n/a	Retail Patch archived here
Doom 3 and Resurrection of Evil	✔	n/a	n/a	A patch used to be hosted at id Software's official website, however the page is no longer up, and a mirror has been reuploaded here. YOU WILL NEED YOUR CD KEYS FROM STEAM! Right-click the games in your Steam library and save the CD keys in a text file for easy access!
Doom 3: BFG Edition	✔	n/a	n/a	No official patch exists, but the engine was released as open source very shortly after the game's release. Precompiled binaries for Windows of the RBDOOM-3-BFG fork are available on GitHub, and it can be compiled+played on Linux and Mac OS X too. You need to copy the "base" folder from the game folder and put it next to the RBDoom3BFG binary.
Freedom Force	✔	n/a	n/a	The cursor fix patch available on Freedom Force Steam discussion removes de DRM.
Gothic 1	✔	n/a	n/a	Download patch from here: http://www.worldofgothic.com/dl/?go=dlfile&fileid=10
Gothic II: Gold Edition	✔	n/a	n/a	Download patch from here: http://www.worldofgothic.com/dl/?go=dlfile&fileid=122
HeXen II	✔	n/a	n/a	Use Hammer of Thyrion from here: http://uhexen2.sourceforge.net/ (The HeXen II source code has been released to the public)
Ion Fury	✔	n/a	✔	Run fury.grp using EDuke32
Prey (2006)	✔	n/a	n/a	Use patch 1.4 from here ; ignore the warning on the page to not use it with the Steam version of the game
Quake	✔	n/a	n/a	Use the DarkPlaces mod from here: https://www.icculus.org/twilight/darkplaces/ (The Quake source code has been released to the public)
Quake II	✔	n/a	n/a	QuakeWiki Alternatively, use KMQuake II from here: http://www.markshan.com/knightmare/ (The Quake II source code has been released to the public)
Quake III Arena	✔	n/a	n/a	Use ioquake3 from here: https://ioquake3.org/ (The Quake III source code has been released to the public)
Recettear: An Item Shop's Tale	✔	n/a	n/a	Official website of Carpe Fulgur
Red Faction	✔	n/a	n/a	Official patch here
Risen	✔	n/a	n/a	Download update from here: ftp://ftp.kochmedia.com/pub/hotline/deepsilver/risen/Risen_Patch_1.10_MUI_HP.zip
Tropico 3 - Steam Special Edition	✔	n/a	n/a	Download Patch 1.17 but don't install it. Extract with an archive program just the "Tropico3.exe" and replace the .exe in the Steam version.
Two Worlds Epic Edition	✔	?	?	A fanmade patch for simplifying the patch procedure (because of altering registry keys) is available as setup and source code. (4shared links no longer valid) There are also manual instructions and MD5-Hashes for the patch files. Note: The patch procedure has to be repeated on every PC the game is played.
X: Beyond the Frontier	✔	n/a	n/a
X: Tension	✔	n/a	n/a
X2: The Threat	✔	n/a	n/a
X3: Albion Prelude	?	?	?
X3: Reunion	?	?	✔	No need for a patch. In case of Linux, just needs 32-bit version of libxmu installed (else you get "error while loading shared libraries: libXmu.so.6")
X3: Terran Conflict	?	?	?
X4: Foundations	?	?	?	The developers offer a non-steam executable on their website.