| title | developer | year | game type | | pop. |
|---|
| X hextris | author | ? | Linux | action/reflex puzzle | | | label | |
| X Labyrinth - The aMAZEment | author | ? | Linux | maze | | | label | |
| X Rebirth | Egosoft | 2015 | Linux | action/reflex simulation flight manag./econ. Science Fiction | | | label | |
| X Rebirth VR Edition | Egosoft | TBA | Linux | action/reflex simulation flight manag./econ. Science Fiction | | | label | |
| X Rebirth: Home of Light | Egosoft | 2016 | Linux | action/reflex simulation flight manag./econ. Science Fiction | | | label | |
| X Solitaire | author | 1999 | Linux | casino/cards | | | label | |
| X Speed Race | Madalin Games | 2013 | Linux | racing/driving sport | | | label | |
| X Speed Race 2 | Madalin Games | 2014 | Linux | racing/driving sport | | | label | |
| X-Blades | Gaijin Entertainment | 2016 | Linux | action/reflex beat 'em up Fantasy | | | label | |
| X-Bomber | New Breed Software | ? | Linux | action/reflex maze | image | | label | |
| X-COM: Apocalypse | author | 2014 | Linux | strategy Science Fiction | | | label | |
| X-Crillion | author | ? | Linux | maze | | | label | |
| X-Men: The Ravages of Apocalypse | Zero Gravity Entertainment | 1997 | Linux | shooter | | | label | |
| X-Moon | Leafo | ? | Linux | | | | label | |
| X-Moto | X-Moto team | 2005 | Linux | action/reflex platformer simulation turn-based | image | subject | label | |
| X-pired | author | 2002 | Linux | action/reflex puzzle | image | | label | |
| X-Plane 10 | Laminar Research | 2012 | Linux | simulation flight | | | label | |
| X-Plane 10 Global - 64 Bit | Laminar Research | 2014 | Linux | simulation flight | | | label | |
| X-Plane 11 | Laminar Research | 2016 | Linux | simulation flight | | | label | |
| X-Plane 5 | Laminar Research | 2001 | Linux | simulation flight | | subject | label | |
| X-Plane 6 | Laminar Research | 2001 | Linux | simulation flight | | subject | label | |
| X-Plane 8 | Laminar Research | 2004 | Linux | simulation flight | | subject | label | |
| X-Plane 9 | Laminar Research | 2008 | Linux | simulation flight | | subject | label | |
| X-Plane Classic | Laminar Research | 2001 | Linux | simulation flight | | subject | label | |
| x0pter | author | 2002 | Linux | maze simulation flight | image | | label | |
| X²: The Threat | Egosoft;Linux Game Publishing | 2006 | Linux | action/reflex simulation flight manag./econ. Science Fiction | image | subject | label | |
| X³: Albion Prelude | Egosoft | 2013 | Linux | simulation flight Science Fiction | | | label | |
| X³: Farnham's Legacy | EGOSOFT | 2021 | Linux | action/reflex simulation flight manag./econ. adventure Science Fiction | | | label | |
| X³: Reunion | Egosoft;Linux Game Publishing;Streamline Studios | 2008 | Linux | action/reflex simulation flight manag./econ. adventure Science Fiction | image | subject | label | |
| X³: Terran Conflict | Egosoft | 2013 | Linux | simulation flight Science Fiction | | | label | |
| X4 | Egosoft | TBA | Linux | action/reflex simulation flight manag./econ. Science Fiction | | | label | |
| X4: Foundations | Egosoft | 2019 | Linux | action/reflex simulation flight manag./econ. adventure Science Fiction | | | label | |
| Xalcyon | author | 2012 | Linux | shooter | | | label | |
| Xalynne's Twins | ParsonSyunOwe | 2008 | Linux | adventure | | | label | |
| Xapalus Deluxe | author | 2014 | Linux | | | | label | |
| XArchon | author | ? | Linux | strategy board game Fantasy | | | label | |
| xasteroids | author | ? | Linux | shooter Science Fiction | | subject | label | |
| XAtaxx | author | ? | Linux | board game turn-based | image | | label | |
| xBaK | author | 2007 | Linux | role-play Fantasy | | subject | label | |
| xbarrel | author | 1994 | Linux | puzzle | | | label | |
| Xbat | author | ? | Linux | action/reflex Science Fiction | image | subject | label | |
| Xbattle | author | ? | Linux | strategy turn-based | image | subject | label | |
| XbattleAI | author | ? | Linux | strategy turn-based | | subject | label | |
| XBill | Psychosoft | 1994 | Linux | action/reflex | | | label | |
| Xbird | author | 2017 | Linux | | | | label | |
| XBlast | author | 2004 | Linux | action/reflex maze | image | subject | label | |
| XBlockOut | author | ? | Linux | action/reflex puzzle | | subject | label | |
| XBoing | author | 1993 | Linux | action/reflex | | | label | |
| XBoing II | author | 1997 | Linux | action/reflex | image | | label | |
| xbomb | author | 1994 | Linux | puzzle | image | subject | label | |
| XBomber | New Breed Software | 1998 | Linux | action/reflex maze Science Fiction | | | label | |
| Xbreaky | author | 2000 | Linux | action/reflex | image | subject | label | |
| XCavalypse | davevillz | 2016 | Linux | shooter | | | label | |
| XChomp | Polygen Corporation | ? | Linux | maze | | | label | |
| XCOM 2 | Firaxis Games | 2016 | Linux | strategy turn-based Science Fiction | | | label | |
| XCOM 2: Long War 2 | Pavonis Interactive | 2017 | Linux | strategy turn-based Science Fiction | | | label | |
| XCOM 2: War of the Chosen | Firaxis;Feral Interactive | 2017 | Linux | strategy | | | label | |
| XCOM: Enemy Unknown | Feral Interactive | 2014 | Linux | strategy turn-based Science Fiction | | | label | |
| XCOM: Enemy Within | Feral Interactive | 2014 | Linux | strategy turn-based Science Fiction | | | label | |
| XCOM: Long War | Long War Studios;Pavonis Interactive | 2015 | Linux | | | | | |
| Xconq | Xconq development team | ? | Linux | strategy board game turn-based | image | subject | label | |
| Xconq | Xconq development team | ? | Linux | strategy board game turn-based | | | label | |
| Xcontractbridge | author | ? | Linux | casino/cards | | subject | label | |
| xcubes | author | 1994 | Linux | puzzle | image | | label | |
| Xcylin | Moebius Games | 2015 | Linux | | | | label | |
| Xdémineur | author | 1993 | Linux | strategy board game | image | subject | label | |
| XDigger | Humboldt-University Berlin | ? | Linux | maze puzzle | image | subject | label | |
| xdriller | author | ? | Linux | action/reflex puzzle | | | label | |
| XEmeraldia | author | 2000 | Linux | action/reflex puzzle | | subject | label | |
| Xeno Crisis | Bitmap Bureau | 2019 | Linux | shooter | | | label | |
| Xeno Shooter | Crazy Dino Game Studio | 2021 | Linux | shooter | | | | |
| Xenocell | Bitgap Games | TBA | Linux | shooter | | | label | |
| Xenocide | author | 2002 | Linux | role-play Horror | | | label | |
| Xenogeddon | author | ? | Linux | Science Fiction | | | label | |
| XenoM | author | 2002 | Linux | action/reflex | | | label | |
| XENOMARINE | Fourfold Games;Logophil | 2016 | Linux | adventure role-play Science Fiction | | | label | |
| Xenon Valkyrie | Diabolical Mind | 2017 | Linux | platformer role-play | | | label | |
| Xenonauts | Goldhawk Interactive | 2014 | Linux | strategy Science Fiction | | | label | |
| XenoRaptor | author | 2019 | Linux | shooter Science Fiction | | | label | |
| xescoba | author | ? | Linux | casino/cards | | | label | |
| XEvil | author | 1994 | Linux | fighting shooter Horror | image | | label | |
| Xfreecell | author | ? | Linux | casino/cards | | | label | |
| XFrisk | - | 1999 | Linux | strategy board game | image | subject | label | |
| XGalaga | author | 1996 | Linux | shooter Science Fiction | image | subject | label | |
| XGalaga: Hyperspace | author | 2001 | Linux | shooter Science Fiction | image | subject | label | |
| XGalaga++ | author | ? | Linux | shooter Science Fiction | image | subject | label | |
| xgammon | author | 1994 | Linux | board game | | | label | |
| XGmae | Lithium | ? | Linux | shooter Science Fiction | | | label | |
| xhalma | author | 2000 | Linux | strategy board game | image | | label | |
| xHearts | author | 1993 | Linux | casino/cards | | | label | |
| xhyperoid | author | 2000 | Linux | shooter | | subject | label | |
| Xiangqi | author | ? | Linux | board game | | | label | |
| Xinsane | author | 1997 | Linux | puzzle | | | label | |
| XInvaders | author | 2000 | Linux | shooter Science Fiction | image | subject | label | |
| XInvaders 3D | author | 2000 | Linux | shooter | image | subject | label | |
| Xiq | Right Square Bracket Left Square Bracket | 2006 | Linux | action/reflex | | | label | |
| xJewel | author | 1996 | Linux | action/reflex puzzle | | | label | |
| Xjigsaw | webmayo | 1996 | Linux | puzzle | | | label | |
| XJump | author | 1997 | Linux | platformer | | subject | label | |
| xlander | author | 1992 | Linux | simulation flight | | | label | |
| XLarn | Swinfjord-Games | 2016 | Linux | adventure role-play | | | label | |
| XLennart | Xylemon | 2015 | Linux | action/reflex Humorous | | | label | |
| xmahjongg | author | 1993 | Linux | board game | image | subject | label | |
| XMemory | author | ? | Linux | puzzle trivia/quiz | | | label | |
| xmille | author | ? | Linux | casino/cards | image | subject | label | |
| xmine | author | ? | Linux | strategy puzzle | | | label | |
| xmpyraminx | - | 1994 | Linux | puzzle | image | | label | |
| xmtriangles | - | 1994 | Linux | puzzle | image | subject | label | |
| XNetBrisk | - | 1995 | Linux | casino/cards | | | label | |
| XNetMine | - | 1994 | Linux | board game puzzle | | | label | |
| XO | Jumpdrive Studios | 2015 | Linux | strategy Science Fiction | | | label | |
| XO World | author | ? | Linux | strategy board game turn-based | | | label | |
| xoEl Empire | Greyman Studios | 2017 | Linux | | | | label | |
| xoids | author | 1996 | Linux | shooter | image | subject | label | |
| XONG | author | 2012 | Linux | shooter | | subject | label | |
| Xong 2009 | author | 2015 | Linux | shooter | | | label | |
| Xonotic | Alientrap Games;Team Xonotic | 2012 | Linux | shooter | | | label | |
| XOR | Dances with Ferrets | 2003 | Linux | puzzle | | | label | |
| xor | faissaloo | 2016 | Linux | action/reflex puzzle | | | label | |
| XorceD - Sashiro's Laedrum | Xorcerox | 2017 | Linux | adventure | | | label | |
| xORcURSES | author | ? | Linux | maze puzzle role-play | image | | label | |
| XorGramana | jwm-art | ? | Linux | maze puzzle | | | label | |
| xpacman | author | 1996 | Linux | action/reflex maze | | subject | label | |
| xpat | author | ? | Linux | casino/cards | | | label | |
| xpat2 | author | ? | Linux | casino/cards | | | label | |
| xpete | author | ? | Linux | shooter | | | label | |
| xpilot | author | ? | Linux | shooter Science Fiction | image | | label | |
| XPilot NG | author | ? | Linux | shooter Science Fiction | | | label | |
| Xploquest | 33 Production | 2017 | Linux | | | | label | |
| xpuck | author | 1997 | Linux | action/reflex sport | | | label | |
| xracer | author | 1999 | Linux | simulation racing/driving Science Fiction | image | subject | label | |
| XRally | author | 2000 | Linux | action/reflex maze | | subject | label | |
| XRick | author | 2002 | Linux | platformer | | | label | |
| xrockman | Unclouded | ? | Linux | platformer | | subject | label | |
| XSC | author | ? | Linux | shooter | | subject | label | |
| xscavenger | author | 1997 | Linux | platformer puzzle | image | subject | label | |
| xscorch | author | 2000 | Linux | shooter simulation turn-based | image | | label | |
| xsfcave | author | ? | Linux | action/reflex | | | label | |
| xshogi | author | ? | Linux | board game turn-based | image | | label | |
| XSkat | - | 1999 | Linux | casino/cards | | | label | |
| XSokoban | ? | ? | Linux | maze puzzle | | | label | |
| xsudoky | author | ? | Linux | puzzle | | | label | |
| xtet42 | author | 1999 | Linux | action/reflex puzzle | | | label | |
| xtic | ? | ? | Linux | board game | | | label | |
| Xtreme Crop Duster Simulator '82 | rjhelms | 2015 | Linux | simulation flight | | | label | |
| xtriangles | author | ? | Linux | puzzle | image | | label | |
| xtris | - | ? | Linux | puzzle | image | | label | |
| xtron | author | 1995 | Linux | action/reflex | image | subject | label | |
| xtruco | author | ? | Linux | casino/cards | | | label | |
| xTux | author | 2003 | Linux | shooter | | | label | |
| XUltima IV | author | 2004 | Linux | role-play | image | subject | label | |
| Xump | Retroguru | 2014 | Linux | puzzle | | | label | |
| Xump: The Final Run | Retroguru | 2014 | Linux | puzzle | | | label | |
| Xump: The Final Run | Retroguru | 2014 | Linux | puzzle | | | label | |
| Xut | DNTeam | ? | Linux | simulation sport | | | label | |
| xwelltris | author | 2002 | Linux | puzzle | image | subject | label | |
| xword | author | 2005 | Linux | puzzle trivia/quiz | image | subject | label | |
| xye | author | 2006 | Linux | puzzle | image | subject | label | |
| Xyz | Gunzil | 2015 | Linux | | | | label | |
