Orbiter - Vostok 1 - First Ever Manned Spaceflight
Orbiter is a free spaceflight simulator, it's got much more detail on the actual flying and vehicles than KSP, but lacks the building and real time rigid body physics that provide so much entertainment in KSP. But if you want to experience real spacecraft then it's probably a better choice
Orbiter is developed by Martin Schweiger and can be downloaded for free from http://orbit.medphys.ucl.ac.uk/
The Vostok Plugin I use is by Igel it supports all of the Vostok missions - including the ones with animals as passengers.
http://www.orbithangar.com/searchid.php?ID=6318
Videos featured in the credits:
https://www.youtube.com/watch?v=6ogimwkItds
https://www.youtube.com/watch?v=qrnp-y8mnFg
Other Videos By Scott Manley
Other Statistics
Orbiter Statistics For Scott Manley
At present, Scott Manley has 1,645,023 views spread across 3 videos for Orbiter, with his channel publishing less than an hour of Orbiter content. This is less than 0.10% of the total video content that Scott Manley has uploaded to YouTube.