The best RTS alternative to Civilization is FreeCiv, which is both free and Open Source. If that doesn't suit you, our users have ranked more than 25 alternatives to Civilization and ten of them are RTS Games so hopefully you can find a suitable replacement. Other interesting RTS Game alternatives to Civilization are Endless Legend, Crusader Kings, Crown of the Gods and Europa 1400: The Guild.
Freeciv is an open-source, turn-based strategy game based on Civilization II. Inspired by the history of human civilization, the game commences in prehistory and your mission is to lead your tribe from the stone age to the space age...
Endless Legend is a turn based 4X fantasy-strategy game from the makers of Endless Space. The purpose of the game is to dominate the world "Auriga" with one of the eight races through either diplomacy or war while developing new...
Unlike other Paradox titles (such as the first two Europa Universalis series), Crusader Kings is a dynasty simulator with similarities to role-playing video games in that it focuses on a trait-based individual whose primary goal is the growth...
Crown of the Gods is an empire-building MMO real-time strategy game made by Gaming Addict Studios that is not, and never will be, pay to win.
Europa 1400: The Guild (also titled Europa 1400 or The Guild) is a simulation game set in Europe from the year 1400 up to 1815. In it, the player tries to guide a family dynasty to power and wealth, starting from one character of limited means.
Dominus is a free multiplayer browser strategy game. Grow in power by conquering other player's castles and making them your vassal. Vassals send their lord part of their income. Make everyone in the game your vassal to become the Dominus.
In the Power of Planets - Earth, achieving success requires a balance between economic expansion, military strength, and technological development.
Tiny Attack is a free-to-play, turn-based strategy game that can be played in any web browser, inspired by games like Advance Wars and Weewar.
Ironfell is a time travel themed massive multi-player online real time strategy game. Travel back in time to plunder resources from the past, re-build your empire and conquer the stars.
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The game is not available for Linux.