Tuxanci is a multiplatform game, inspired by well-known czech game Bulanci (by the SleepTeam Labs team), distributed under GNU GPL license.
UHexen is yet another port of Raven Software/Id software Hexen game for Simple Directmedia Layer and FreeBSD console.
Unreal Tournament 2003
Unreal Tournament 2003 is a lightning-fast, no-holds-barred sport of the future, where warriors face off like the Gladiators of ancient Rome to determine the ultimate combatant.
Unvanquished is a free, open-source first-person shooter combining real-time strategy elements with a futuristic, sci-fi setting. The player can choose from either team, providing a fresh gameplay experience on both sides of the conflict. Read more
Vavoom is a source port based on sources of Doom, Heretic, Hexen and a little bit from Quake. Supported platforms are DOS, Windows and Linux.
Vore Tournament is a first person shooter based on the DarkSpace engine. It is a fork from the Nexuiz / Xonotic projects. In this game players use a hook gun which is used to catch and pull other players toward you, or swing around the map. Players need to swallow and digest their enemies to score points. Read more
Wolf4SDL is an open-source port of id Software's classic first-person shooter Wolfenstein 3D to the cross-plattform multimedia library 'Simple DirectMedia Layer (SDL)'.
WolfGL is a famous DOS game from 1992 created by id Software. This is an attempt to port the source (released in 1995) to Linux.
ZDoom is an enhanced port of the official DOOM source. It features support for all Hexen editing features (including ACS, hubs, etc.), support for most BOOM editing features, freelook, jumping, and translucency support, a Quake-style console, high screen resolutions, removal of the original DOOM's limits, support for many more music formats (including MOD, IT, XM, S3M, MIDI, MP3, and MUS), better mouse support, UDP networking, and more.
ZEQ2 Lite is an open-sourced and mod expandable project based on a highly modified ioQuake3 engine foundation and features many true-to-reference Dragon Ball-Z visuals and mechanics. Read more