Orbiter is described as 'Realistic 3D real-time space flight simulator program' and is an game in the games category. There are more than 10 games similar to Orbiter for a variety of platforms, including Windows, Linux, Steam, Mac and Android apps. The best Orbiter alternative is Space Engine. It's not free, so if you're looking for a free alternative, you could try Zen Koi or Pioneer. Other Orbiter like games are Universe Sandbox, Spore, Kerbal Space Program and Elite: Dangerous.
Space Engine - a real-time 3D space simulator, procedural universe generator and visualiser. It lets you explore the universe in three dimensions, starting from planet Earth to the most distant galaxies.
Space Engine is the most popular Windows alternative to Orbiter.
Space Engine is the most popular commercial alternative to Orbiter.
Universe Sandbox is an interactive space simulator for Windows based PCs.
Unlike most astronomy software that just shows you what the sky looks like or where the planets are, Universe Sandbox is a powerful gravity simulator. You can add another star to our solar system and watch.
Universe Sandbox is the most popular Mac & Linux alternative to Orbiter.
Zen Koi is a fun, relaxing and stylish mobile game experience from LandShark Games. Grow, breed and collect beautiful Japanese carp as they make their way to mythological dragon form.
Zen Koi is the most popular Android, iPhone, iPad & Android Tablet alternative to Orbiter.
Zen Koi is the most popular free alternative to Orbiter.
Spore is a multi-genre single-player god game developed by Maxis and designed by Will Wright.
Spore is more akin to Minecraft as game of creative play, whereas Orbiter is a "game" for simulating the space-flight experience.
Create and manage your own space program, build and fly spacecraft, and try to conquer space.
KSP, while cool in itself, is not that much like Orbiter. The two shares the space-thing setting, but similarities kinda end there. Orbiter is a full-blown simulator, while KSP provides more of a casual (good!) experience for those who likes space, spaceships, etc (KSP also lets you create and improve along the way your spaceship)
Most users think Kerbal Space Program is a great Orbiter alternative.
Elite: Dangerous is a space adventure, trading, and combat simulator that is the fourth release in the Elite video game series.
Pioneer is a space adventure game set in the Milky Way galaxy at the turn of the 31st century. The game is open-ended, and you are free to explore the millions of star systems in the game. You can land on planets, slingshot past gas giants, and burn yourself to a crisp flying...
Pioneer is the most popular Open Source alternative to Orbiter.
A game of missions, trade and space combat in the 31st century using the Pioneer Space Sim engine with many additions and improvements.
Set up a Portal in your real-life room, and seamlessly step into any spatial worlds you create with AI.
Systems Tool Kit (STK) is a platform for analyzing and visualizing complex systems in the context of your mission. Interact with data from platforms across the aerospace, defense, telecommunications, and other industries.
Systems Tool Kit is the most popular SaaS alternative to Orbiter.
Space Simulator is a realistic space flight simulator for iOS and Android. It is an open-ended simulation where players can free roam Solar System or reenact historical NASA space program missions.
Reentry is a space flight simulator based on real life spacecrafts. You create a new astronaut, gain levels and experience for every move you make by completing missions in space.
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Orbiter is a spaceflight simulator that has a 1:1 replica of the Solar System and utilises realistic spaceflight physics, while Spore is more of a casual game that focus on the evolution of your species from its origin (where spaceflight is only a small part of it), set in a procedural galaxy with cartoony graphics.