| title | developer | year | platform | | pop. |
|---|
| UFO 2000 | UFO2000 Development Team | 20?? | Windows | strategy turn-based Science Fiction | | | label | |
| UFO 2000 | UFO2000 Development Team | 20?? | BeOS | strategy turn-based Science Fiction | | | label | |
| Undead Lily | Winter Wolves | TBA | Linux | adventure role-play | | | label | |
| Underworld Ascendant | Otherside Entertainment | TBA | Linux | action/reflex role-play Fantasy | image | | label | |
| Unexplored | Ludomotion | 2017 | Linux | adventure role-play | | | label | |
| Universe Edge | Rebellion534 | 2015 | Linux | simulation flight manag./econ. Science Fiction | | | label | |
| Universe Sandbox ² | Giant Army | TBA | Linux | simulation Science Fiction | | | label | |
| Unknown Horizons | Unknown Horizons Developers | 2009 | Windows | strategy Historical | image | | label | |
| Unvanquished | Unvanquished Development | TBA | Linux | Science Fiction | | | label | |
| Volvox | Neotenia | TBA | Linux | | | | label | |
| VOX | AlwaysGeeky | TBA | Linux | role-play | | | label | |
| Voxatron | Lexaloffle | TBA | Linux | shooter | image | | label | |
| Voxatron | Lexaloffle | TBA | Mac OS X | shooter | | | label | |
| Voxatron | Lexaloffle | TBA | Windows | shooter | image | | label | |
| Voxelnauts | Retro Ronin | 2015 | Linux | simulation role-play Fantasy | | | label | |
| Wanderer | Red Cloak Games | 2015 | Linux | platformer role-play | | | label | |
| WARTILE | Playwood Project | 2017 | Linux | strategy board game role-play | | | label | |
| Windlands | Psytec Games | TBA | Linux | | | | label | |
| Wing Commander Flat Universe | MaslasBros | 2015 | Linux | shooter Science Fiction | | | label | |
| Wings of Saint Nazaire | author | TBA | Linux | shooter simulation flight Science Fiction | | | label | |
| Wizard of Legend | Contingent99 | TBA | Mac OS X | action/reflex Fantasy | | | label | |
| Wizard of Legend | Contingent99 | TBA | Linux | action/reflex Fantasy | | | label | |
| Wolcen: Lords of Mayhem | Wolcen Studio | 2016 | Linux | role-play Fantasy | | | label | |
| Word Play | My Game Company | 2013 | Linux | action/reflex puzzle | | subject | label | |
| World of Warcraft | Linux Game Publishing;Blizzard | 2013 | Linux | action/reflex role-play Fantasy | | | label | |
| Wubmarine | Semag Studio | 2014 | Linux | | | | label | |
| X Rebirth VR Edition | Egosoft | TBA | Linux | action/reflex simulation flight manag./econ. Science Fiction | | | label | |
| X4 | Egosoft | TBA | Linux | action/reflex simulation flight manag./econ. Science Fiction | | | label | |
| Xenonauts 2 | Goldhawk Interactive | 2018 | Windows | strategy turn-based Science Fiction | | | label | |
| XO | Jumpdrive Studios | 2015 | Linux | strategy Science Fiction | | | label | |
| Yandere Simulator | author | 2015 | Windows | simulation Manga | image | | label | |
| Zelda: Fates of the World | ? | TBA | Linux | action/reflex role-play | image | | label | |
| ZombieSurvivors | IndieGears Studios | TBA | Linux | platformer shooter Horror | | | label | |
