Post your own recommendations, and I'll pop em in! And be sure to check this out too!
#Awesome & Free Linux Games:
Strategy / Tactics:
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FreeCiv - Free clone of Civilization
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FreeCol - Clone of Colonization
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FreeOrion - Clone of Master of Orion
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OpenRA - Open-Source implementation of C&C: Red Alert, Tiberian Sun, and Dune 2000
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Tanks of Freedom - Turn based strategy, similar to Advance Wars on the GBA.
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The Battle For Wesnoth - Open-source turn-based fantasy RPG/Strategy hybrid
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Hedgewars - Clone of the game Worms
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UFO: Alien Invasion - Turn-based tactical combat game, inspired by the X-Com series.
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Argentum Age - Open-source fantasy card game
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UFO2000 - Another X-Com inspired game
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Wyrmsun - An interesting fantasy RTS
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0 A.D. - Incredible 3D RTS, professional grade. (Not suitable for low-end systems)
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Spring RTS - RTS game engine that has a few complete games made from it, like Zero-K
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Warzone 2100 - 3D RTS that offers campaign, multi-player, and single-player skirmish modes.
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Megaglest - RTS where you control the armies of one of seven different factions
City Builder/Tycoon:
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OpenTTD - open-source clone of Transport Tycoon Deluxe
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Unknown Horizons - Village builder inspired by the Anno series
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Scorched 3D - Simple turn-based or real-time artillery strategy game
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Simutrans - Open-source transportation simulator clone.
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Widelands - Polished Settlers clone
Adventure/RPG:
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Heroine's Quest - Fantastic free Point'n'Click RPG inspired by the Quest for Glory series from Sierra
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Beneath a Steel Sky - Classic adventure game with excellent artwork and voice talent. Should be available in the Ubuntu repos
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ScummVM's Freeware Games - Some fantastic point'n'click games here, my favourite probably being Dreamweb
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Solarus Games - Solarus is a game engine for making Zelda-like games, but there are many completed games available on their website, and also community made games
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Flare - A surprisingly in-depth and polished isometric RPG
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Eldevin - F2P Runescape clone with a distinct charm
Roguelikes:
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Dwarf Fortress - The most famous Rogue-like/City-builder around. Extremely daunting to get into, but very rewarding if you do (Not suitable for low-end systems)Not Libre yet -
Roguebox Adventures - Neat little graphical rogue-like with a focus on survival and crafting. Source code here for packagers
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Cataclysm: Dark Days Ahead - Unique zombie survival rogue-like, very thrilling to play.
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UnReal World - Crazy in-depth survival roguelike based in iron age Finland
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Dungeon Crawl Soup - A roguelike adventure to find the mystifyingly fabulous Orb of Zot.
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NetHack - Does this need an introduction?
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Brogue - Don't know much about this one
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Tales of Maj'Eyal: Age of Ascendancy - Ultra polished graphical roguelike with the option to save your game
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ADOM (Ancient Domains of Mystery) - Another great roguelike, with a huge world and many ways to play
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DoomRL - DOOM, but roguelike!
Space Sim/Trading/RPG:
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Ur-Quan Masters - Updated version of Star Control II. Be sure to download the Voice Pack! (Alternative HD version available here)
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Endless Sky - 2D space trading and combat game similar to the classic Escape Velocity series
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Oolite - Well done Elite remake, with plentiful mod support.
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Pioneer - a remake of the sequel to Elite, Frontier.
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Vega Strike - Open Source 3D Action-Space-Sim
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Naev - open-source game about space exploration, trade and combat
Puzzle:
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FloboPuyo - Open-source clone of PuyoPuyo. Source-code for packagers
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Frozen Bubble - Open-source clone of Bubble Bobble.
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Duck Marines - Open-source clone of Chu Chu Rocket. Source code here for distro packagers.
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Pingus - Lemmings clone.
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Portable Puzzle Collection - 39 old school puzzle games
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Blockout2 - 3D Tetris
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Coregrounds - Online Competitive Tower-Defense
Arcade/Casual:
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SSVOpenHexagon - Open-source clone of Super Hexagon. Source code for packagers
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LBreakout2 - Open-source breakout clones.
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Witch Blast - Open-source clone of Binding of Isaac. Source code here for packgers.
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TeeWorlds - Online 2D shooter
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OpenTyrian - The famous Shmup
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Kobo Deluxe - 8-way scrolling shooter
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Chromium-BSU - Top-down arcade Shmup
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Altitude - 2D Online plane combat
Side-Scroller:
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Mr. Rescue - Play as a fireman rescuing people. Source code here for people who want to package it for their distro
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Sienna - Fun little runner/platformer. Source code
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Super Tux - Open-source Mario clone, and currently in need of help if it's to stay alive
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Secret Maryo - Mario 3 Clone
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Hurrican - Inspired by the classic game Turrican. Mostly forgotten nowadays, so you may have to compile it from here
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Frogatto - Platformer with great music and graphics. Should be available in the Ubuntu repos for free
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Commander Keen 4 - Classic Shareware DOS title ported to Linux
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OpenClonk - Weird Online 2D Mining
Racing:
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SuperTuxCart - Open-source clone of the Mario Cart games (Not suitable for low-end systems)
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Yorg - A top-down racer in the Micro Machine's style.
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Speed Dreams - Realistic racing sim
First Person Shooter/Stealth:
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Cube 2 - Quake-like Arena online FPS with multiple game modes
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Xonotic - Quake-like Arena online FPS
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FreeDoom - Best used with Chocolate Doom
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Dystopia - A cyberpunk online FPS
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Urban Terror - Fast paced online FPS reminiscent of Counter-Strike
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OpenArena - Online arena FPS using the id tech engine
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Fistful of Frags - Online Western FPS
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Ravenfield - Singleplayer Battlefield type game
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Termulous - RTS/FPS Hybrid with aliens!
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Alien Arena - Retro Sci-Fi Online FPS
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Red Eclipse - Online FPS with parkour
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ET Legacy - Wolfenstein: Enemey Territory for modern systems
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The Dark Mod - Fan-made spin-off the the fantastic Thief series (Not suitable for low-end systems)
Minecraft Clones:
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Minetest - Uses C++, Requires mods to be fun
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TrueCraft - Clean-room implementation of Minecraft 1.7.3
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Voxelands - standard clone?
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Terasology - Fancy lookin' Minecraft
ziq wrote
Lots of stuff on this list I didn't know about, thanks.
I wish strategy games weren't so imperialist. http://unknown-horizons.org/ looks good but the whole 'build your colony' shit makes me sad.