Here are some nice free games for Linux:
0 A.D. - Real-time strategy game of ancient warfare
A7Xpg - Old school chase action game
Adonthell - Role playing game engine
Airstrike - 2D dogfighting game
Alien Arena - FPS deathmatch with modern features
Alien Blaster - Stop the invasion of the aliens
Armagetron - 3D multiplayer game that emulates the race from the movie Tron
Advanced Strategic Command - Turn based strategy like Battle Isle
AssaultCube - Multiplayer, first-person shooter game, based on the CUBE engine
AstroMenace - 3D space scroll-shooter with spaceship upgrade possibilities
Atomix - Puzzle game where you move atoms to build a molecule
Beneath a Steel Sky - Point and click adventure
BlockOut II - adaptation of original BlockOut with few graphic improvements
BomberClone - Clone of the game AtomicBomberMan
Bos Wars - Futuristic real time strategy game
BZFlag - 3D online tank battle game
Chromium B.S.U. - Fast paced, arcade-style, top-scrolling space shooter
Crimson Fields - Turn-based tactical war game like Battle Isle
CRRCSim - Model-airplane flight simulation
Cube 2: Sauerbraten - First person shooter, the successor of the Cube FPS
Cytadela - Conversion of an Amiga first person shooter
Dust Racing 2D - Tile-based 2D racing game
Endless Sky - 2D space trading and combat game
Eat The Whistle - Soccer game by Hurricane Studios for the Amiga
Extreme Tux Racer - High speed arctic racing game based on Tux Racer
Flight of the Amazon Queen - Point and click adventure
FlightGear - Sophisticated and open flight simulator
Freeciv - Empire-building strategy inspired by the history of human civilization
FreeCol - Turn-based strategy game based on Colonization
Freedoom - Doom data files
FreeOrion - Turn-based space empire and galactic conquest game
Free Tennis - Free tennis simulation
Frets on Fire - Game of musical skill and fast fingers
Frogatto & Friends - Action-adventure, starring a certain quixotic frog
Frozen Bubble - Clone of Puzzle Bobble
Gigalomania - 2D Real Time Strategy god game like MegaloMania
Hedgewars - Turn based strategy, artillery, action and comedy game
LBreakout2 - Successor to LBreakout
Lincity - City simulation game
LinCity-NG - City simulation game
Lugaru HD - Third-person action game
Lure of the Temptress - Point and click adventure
Maelstrom 3.0 - Pilot your ship through the dreaded "Maelstrom" asteroid belt
MegaGlest - 3D real-time strategy
NetPanzer - Panzer multiplayer game
Neverball - Marble Madness clone
Nexuiz - First person shooter
OpenArena - Deathmatch FPS
OpenTTD - Simulation game clone of Transport Tycoon Deluxe
Orbital Eunuchs Sniper - Overhead shooting game
Pingus - Lemmings clone
Pioneers - The Settlers of Catan implementation
PokerTH - Texas Hold'em Poker
PrBoom+ - Doom source port, needs Freedoom
Red Eclipse - Fun-filled new take on the first person arena shooter
Seven Kingdoms: Ancient Adversaries - Fantasy real-time strategy
Simutrans - Transportation simulator
SuperTux - 2D jump'n run sidescroller
SuperTuxKart - 3D arcade racer with a variety characters, tracks, and modes
The Battle for Wesnoth - Turn-based strategy game with a high fantasy theme
TORCS - Car racing simulation
Trackballs - Marble Madness clone
Trigger Rally - 3D rally simulation
UFO: Alien Invasion - Inspired by Microprose UFO (X-COM)
Unknown Horizons - 2D realtime strategy simulation
Ur-Quan Masters - Star Control II Clone on modern platforms
Warzone 2100 - Real-time strategy and real-time tactics
Widelands - Real-time strategy inspired by Settlers II
XMoto - 2D motocross platform game
sudo apt-get install 0ad 7kaa a7xpg adonthell airstrike alien-arena alienblaster armagetronad asc assaultcube astromenace atomix beneath-a-steel-sky blockout2 bomberclone boswars bzflag chromium-bsu crimson crrcsim cytadela dustracing2d endless-sky etw extremetuxracer flight-of-the-amazon-queen flightgear freeciv freecol freedoom freeorion freetennis fretsonfire frogatto frozen-bubble gigalomania hedgewars lbreakout2 lincity lincity-ng lugaru lure-of-the-temptress maelstrom megaglest netpanzer neverball nexuiz openarena openttd orbital-eunuchs-sniper pingus pioneers pokerth prboom-plus redeclipse sauerbraten simutrans supertux supertuxkart torcs trackballs trigger-rally ufoai unknown-horizons uqm warzone2100 wesnoth widelands xmoto
0 A.D. - Real-time strategy game of ancient warfare
A7Xpg - Old school chase action game
Adonthell - Role playing game engine
Airstrike - 2D dogfighting game
Alien Arena - FPS deathmatch with modern features
Alien Blaster - Stop the invasion of the aliens
Armagetron - 3D multiplayer game that emulates the race from the movie Tron
Advanced Strategic Command - Turn based strategy like Battle Isle
AssaultCube - Multiplayer, first-person shooter game, based on the CUBE engine
AstroMenace - 3D space scroll-shooter with spaceship upgrade possibilities
Atomix - Puzzle game where you move atoms to build a molecule
Beneath a Steel Sky - Point and click adventure
BlockOut II - adaptation of original BlockOut with few graphic improvements
BomberClone - Clone of the game AtomicBomberMan
Bos Wars - Futuristic real time strategy game
BZFlag - 3D online tank battle game
Chromium B.S.U. - Fast paced, arcade-style, top-scrolling space shooter
Crimson Fields - Turn-based tactical war game like Battle Isle
CRRCSim - Model-airplane flight simulation
Cube 2: Sauerbraten - First person shooter, the successor of the Cube FPS
Cytadela - Conversion of an Amiga first person shooter
Dust Racing 2D - Tile-based 2D racing game
Endless Sky - 2D space trading and combat game
Eat The Whistle - Soccer game by Hurricane Studios for the Amiga
Extreme Tux Racer - High speed arctic racing game based on Tux Racer
Flight of the Amazon Queen - Point and click adventure
FlightGear - Sophisticated and open flight simulator
Freeciv - Empire-building strategy inspired by the history of human civilization
FreeCol - Turn-based strategy game based on Colonization
Freedoom - Doom data files
FreeOrion - Turn-based space empire and galactic conquest game
Free Tennis - Free tennis simulation
Frets on Fire - Game of musical skill and fast fingers
Frogatto & Friends - Action-adventure, starring a certain quixotic frog
Frozen Bubble - Clone of Puzzle Bobble
Gigalomania - 2D Real Time Strategy god game like MegaloMania
Hedgewars - Turn based strategy, artillery, action and comedy game
LBreakout2 - Successor to LBreakout
Lincity - City simulation game
LinCity-NG - City simulation game
Lugaru HD - Third-person action game
Lure of the Temptress - Point and click adventure
Maelstrom 3.0 - Pilot your ship through the dreaded "Maelstrom" asteroid belt
MegaGlest - 3D real-time strategy
NetPanzer - Panzer multiplayer game
Neverball - Marble Madness clone
Nexuiz - First person shooter
OpenArena - Deathmatch FPS
OpenTTD - Simulation game clone of Transport Tycoon Deluxe
Orbital Eunuchs Sniper - Overhead shooting game
Pingus - Lemmings clone
Pioneers - The Settlers of Catan implementation
PokerTH - Texas Hold'em Poker
PrBoom+ - Doom source port, needs Freedoom
Red Eclipse - Fun-filled new take on the first person arena shooter
Seven Kingdoms: Ancient Adversaries - Fantasy real-time strategy
Simutrans - Transportation simulator
SuperTux - 2D jump'n run sidescroller
SuperTuxKart - 3D arcade racer with a variety characters, tracks, and modes
The Battle for Wesnoth - Turn-based strategy game with a high fantasy theme
TORCS - Car racing simulation
Trackballs - Marble Madness clone
Trigger Rally - 3D rally simulation
UFO: Alien Invasion - Inspired by Microprose UFO (X-COM)
Unknown Horizons - 2D realtime strategy simulation
Ur-Quan Masters - Star Control II Clone on modern platforms
Warzone 2100 - Real-time strategy and real-time tactics
Widelands - Real-time strategy inspired by Settlers II
XMoto - 2D motocross platform game
sudo apt-get install 0ad 7kaa a7xpg adonthell airstrike alien-arena alienblaster armagetronad asc assaultcube astromenace atomix beneath-a-steel-sky blockout2 bomberclone boswars bzflag chromium-bsu crimson crrcsim cytadela dustracing2d endless-sky etw extremetuxracer flight-of-the-amazon-queen flightgear freeciv freecol freedoom freeorion freetennis fretsonfire frogatto frozen-bubble gigalomania hedgewars lbreakout2 lincity lincity-ng lugaru lure-of-the-temptress maelstrom megaglest netpanzer neverball nexuiz openarena openttd orbital-eunuchs-sniper pingus pioneers pokerth prboom-plus redeclipse sauerbraten simutrans supertux supertuxkart torcs trackballs trigger-rally ufoai unknown-horizons uqm warzone2100 wesnoth widelands xmoto
