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Orbiter, like magnetic pointed out, is probably what you're looking for! That having been said, I plan to introduce spacecraft that can be controlled by the user in a realistic manner at some point, although I want to get the physics (thrust, attitude control and so on) right before introducing this feature. If you check back in a couple of days there will be a simulation of the up and coming Dear Moon mission (the plan, to send a bunch of artists in a free return trajectory around the Moon, concocted by a Japanese billionaire that will be executed by SpaceX).

Have you looked into Orbiter 2016? http://orbit.medphys.ucl.ac.uk -

I recently learned about it and wanted to try it after playing with KSP, but it seems it's Windows only.

Bach's Air is now permanently ingrained into my brain, paired with the soothing rumbling of booster rockets.

You might be interested in this mod for KSP which adds n-body physics:

https://github.com/mockingbirdnest/Principia

> You might be interested in this mod for KSP which adds n-body physics

...aaaand there goes all the work I was planning to do on the winter holidays!