Orbiter Space Flight Simulator 2016 Edition
Orbiter is a simulator that gives you an idea what space flight really feels like - today and in the not so distant future. And best of all: you can download it for free!
What is Orbiter?
Orbiter is a real-time 3D space flight simulator for the Windows PC. The concept is similar to traditional flight simulator software, but you are not limited to atmospheric flight. Orbiter allows you to experience manned and unmanned space flight missions from the pilot's perspective. Take control from launch to orbtial insertion, rendezvous with space stations, deploy and recapture satellites, and re-enter and land on a planetary surface. The playground is our solar system, and you can even execute missions to the moon or other planets. (Time compression is available to shorten long cruise phases.) Orbiter accurately models the physics of spaceflight, which makes it possible to either recreate historic missions, or use it as a sandbox for futuristic spacecraft concepts.
For more details on Orbiter, have a look at the mission statement, or the Orbiter Wikipedia entry.
Is Orbiter really free?
The full Orbiter software can be downloaded from this site and is free for personal and non-commercial use. For details, see the Orbiter Freeware License terms. You can distribute Orbiter, but you are not allowed to charge a fee for it. If you paid for Orbiter (either on its own or as part of a compilation), you have probably been ripped off.
If you like Orbiter, you can show your appreciation by making a donation, but this is entirely voluntary.
If you want to use Orbiter in a context not covered by the freeware license terms, you must get written permission from the author.
Note that 3rd party Orbiter addons may be distributed under different licensing terms.