X is described as 'science fiction space trading and combat simulator series created by German developer Egosoft. The series is set in the X-Universe where several races populate a number of worlds connected by jumpgates'. There are more than 10 games similar to X for a variety of platforms, including Windows, Mac, Linux, Android and Steam. The best alternative is EVE Online, which is free. Other X like games are Elite: Dangerous (Paid), Oolite (Free, Open Source), Star Citizen (Paid) and Space Rangers (Paid).
EVE Online is a massive multiplayer online game that offers limitless potential to discover, explore and conquer an amazing science fiction universe where you pilot spaceships, fight, trade, and form corporations and alliances with other players.
Elite: Dangerous is a space adventure, trading, and combat simulator that is the fourth release in the Elite video game series. Piloting a spaceship, the player explores a realistic 1:1 scale open world galaxy based on the real Milky Way, with the gameplay being open-ended. Represent entire series of Elite: Dangerous games including Elite,Elite: Dangerous,.
Oolite is a space sim game, inspired by Elite. Among Oolite's several similarities to its inspirational source, the gaming experience is enhanced by the context set in Elite's original manual, and the accompanying novella, The Dark Wheel.
The game is dynamic and open-ended in a fashion that has been compared to Elite and Star Control 2. Represent entire series of Space Rangers games including Space Rangers, Space Rangers 2: Dominators, Space Rangers: Legacy.
Starsector (formerly “Starfarer”) is an in-development open-world single-player space-combat, roleplaying, exploration, and economic game. You take the role of a space captain seeking fortune and glory however you choose.
CSC is an open-universe, sandbox-style space MMO with a player-owned economy. Command starships and earn digital items to buy, sell, or trade without limits both inside and outside of the game universe.
Stellar Wanderer is a beautiful old-school space opera set in a vast open-world universe. Explore the galaxy and become a FIGHTER, TRADER, TANK or ENGINEER while following the main story line or choosing your favorite side missions.