Fallen Earth MMO

http://www.fallenearth.com

Those familiar with Twilight 2000, Wasteland and the Fallout games will be very comfortable playing this game.

Brief List of the Fallout games so far.

Wasteland (Unofficial Predecessor)
Fallout
Fallout 2
Fallout Tactics: Brotherhood of Steel
Fallout: Warfare (table-top miniatures game)
Fallout: Van Buren (Unreleased)
Fallout 3
Fallout New Vegas (In Development)
Fallout 4 (In Development)
Project V13 (MMORPG)

ORBITER

ORBITER is a free flight simulator that goes beyond the confines of Earth's atmosphere. Launch the Space Shuttle from Kennedy Space Center to deploy a satellite, rendezvous with the International Space Station or take the futuristic Delta-glider for a tour through the solar system - the choice is yours.
But make no mistake - ORBITER is not a space shooter. The emphasis is firmly on realism, and the learning curve can be steep. Be prepared to invest some time and effort to brush up on your orbital mechanics background.

http://orbit.medphys.ucl.ac.uk/orbit.html

Fallout 3: Faygeleh's Quest (unofficial)