Elite: Dangerous is described as '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'. There are more than 10 games similar to Elite: Dangerous for a variety of platforms, including Windows, Mac, Linux, Steam and GOG.com. The best alternative is Celestia, which is both free and Open Source. Other Elite: Dangerous like games are No Man's Sky (Paid), EVE Online (Freemium), X (Paid) and FTL: Faster Than Light (Paid).
Celestia is an application for real-time 3D visualization of space, with a detailed model of the solar system, over 100,000 stars, more than 10,000 galaxies, and an extension mechanism for adding more objects.
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.
X is a 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. Represent entire series of X games including X: Beyond the Frontier, X²: The Threat, X³: Reunion, X³: Terran Conflict, X Rebirth, X4: Foundations.
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.