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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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.

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.

 

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.

OpenRA – Tiberian Dawn

An alliance of nations fights to protect Europe and northern Africa from a mysterious terrorist organization and the valuable but toxic alien mineral, Tiberium, that is slowly spreading over the world.
The Tiberian Dawn mod focuses on fast and fluid play, taking heavy influences from modern RTS games.
” 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.
Centos/Fedora/Korora users will install via openSUSE repository.