0 A.D.

0 A.D. is a free and open-source, cross-platform real-time strategy game under development by Wildfire Games.
 It is a historical war and economy game focusing on the years between 500 B.C. and 1 B.C. for the first part, and a planned second part for the years 1 A.D. to 500 A.D.
 The game is cross-platform, playable on Windows, OS X, Linux, and OpenBSD. The game aims to be entirely free and open-source, using the GPLv2+ license for the game engine and CC BY-SA for the game art.
0 A.D. originally began as a comprehensive total conversion mod concept for Age of Empires II: The Age of Kings in June 2001. With limited design capabilities, the team soon turned to trying to create a full independent game based on their ideas.
 The game has been in development since 2000, with actual work starting in 2003.” source: wikipedia

Installation:
You can download the game from the project webpage, sourceforge, github or install it directly from your distribution repository through package manager.

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Alien Arena

AlienArena a free first-person shooter

Alien Arena (initially CodeRED: Alien Arena) is a free, stand-alone first-person shooter computer game.
 Begun by COR Entertainment in 2004, the game combines a 1950s-era sci-fi atmosphere with gameplay similar to the Quake, Doom, and Unreal Tournament series.
 Alien Arena focuses mainly on online multiplayer action, although it does contain single-player matches against bots.  Alien Arena has been released for Microsoft Windows, OS X, Linux, and FreeBSD. While the game’s content is proprietary freeware, prohibiting  commercial re-sale, the CRX engine is open source.  In 2013 the assets license was loosened, which allowed the inclusion in Linux distributions.” source: wikipedia

Built for fraggers by fraggers.
 Alien Arena is a furious frag fest with arenas ranging from the small, to the massive.
With a large built-in player base, it’s never hard to find a good match going on, at any hour of the day.
The community is friendly, as well as prolific. Dozens of maps, models, and various accessories have been created by community members to add on to the game experience.” source: planetarena.org

  Installation:
 You can download the game from the project webpage or install it directly from your distribution repository through package manager.

 

Warzone 2100

“In Warzone 2100, you command the forces of The Project in a battle to rebuild the world after mankind has almost been destroyed by nuclear missiles.
The game offers campaign, multi-player, and single-player skirmish modes. An extensive tech tree with over 400 different technologies, combined with the unit design system, allows for a wide variety of possible units and tactics.
Warzone 2100 was originally developed as a commercial game by Pumpkin Studios and published in 1999, and was released as open source by them in 2004, for the community to continue working on it.”  source: wz2100.net

“In the late 21st century, the world’s civilizations are wiped out by a series of nuclear strikes, seemingly caused by a massive malfunction of the new NASDA strategic defense system.
While most of the survivors form scavenger bands to survive, the player is a member of a group named “The Project”, that is more organised and seeks to rebuild civilization using pre-war technology.” source: wikipedia.org

Installation:
You can download the game from sourceforge, github or install it directly from your distribution repository through package manager.

Flare

Flare a free, open-source RPG game
Flare is an open source, 2D action RPG licensed under the GPL3 license. Its game play can be likened to the games in the Diablo series.
While the core engine is written in C++ with SDL2, there is an easy to use modding interface. Using the modding interface, it’s possible to create entirely new games.” source: flarerpg.org
Installation:
You can download the game from the project webpage, sourceforge, github or install it directly from your distribution repository through package manager.

Transmissions: Element 120


TE120 is a short single player experience set in the Half-Life Universe featuring a gravity defying weapon that allows you to jump buildings and sustain large falls.

The story takes place at a mysterious date & location. Where are you? Why have you been sent?” source: steam description

Installation:
You can download the game client from the project webpage on steam.

 

 

Zombie Defense

A modern hybrid of the classic RTS and modern Tower Defense.
 Recruit soldiers, place them on slots and let them shoot incoming waves of zombies by their own.
 Order supplies, throw grenades, order airstrikes and many more… Perfect mix of strategy, tactics and micromanagement.” source: steam description

  Installation:
 You can download the game client from the project webpage or steam.

 

AssaultCube a FREE, multiplayer, first-person shooter

AssaultCube, formerly ActionCube, is a free and open source software first-person shooter video game, based on the Cube engine.
It takes place in realistic environments, with fast, arcade gameplay. Although the main focus of  AssaultCube is multiplayer online gaming, a single-player mode consists of computer-controlled bots.
AssaultCube utilises efficient bandwidth usage, allowing the game to be run with connection speeds as low as 56kbit/s. It can run on older computer hardware as well.
AssaultCube is available for free on Microsoft Windows, OS X, and Linux. The game engine is free software, however parts of the accompanying game media, such as the graphics, are released under non-free licenses.
AssaultCube was designed to be more realistic and team-oriented than Cube while keeping Cube’s distinctive fast-paced gameplay. In comparison to other games, AssaultCube is slower than Quake but faster than Counter-Strike.
There are two different teams in AssaultCube, called the “Cubers Liberations Army” (CLA) and the “Rabid Viper Special Forces” (RVSF).” source: wikipedia

Installation:
You can download the game client from the project webpage or install it directly from your distribution repository through package manager.

OpenRA – Dune 2000

Three great houses fight for the precious spice melange.
He who controls the spice controls the universe!
Establish a foothold on the desert planet Arrakis, where your biggest threat is the environment.
The Dune 2000 mod currently focuses on providing an experience that is authentic to the original game.
” source: openra.net

Installation:
You can download the game client from the project webpage or install it directly from your distribution repository through package manager.
Fedora/korora users will install via openSUSE repository.

 

OpenRA – Red Alert

In a world where Hitler was assassinated and the Third Reich never existed, the Soviet Union seeks power over all of Europe.
 Allied against this Evil Empire, the free world faces a Cold War turned hot.
The Red Alert mod focuses on strategy, providing a range of units and tactics to conquer the land, sea, and air.
” source: openra.net

Installation:
You can download the game client from the project webpage or install it directly from your distribution repository through package manager.
Fedora/korora users will install via openSUSE repository.