Https://solaris.games is directly inspired by Subterfuge. Source: about 1 year ago

You can sign up to play here: https://solaris.games/. Source: over 1 year ago

Are you familiar with Solaris? I think you'd love it. Source: over 1 year ago

Solaris is an open source 4X slow-burn strategy game on the web focused on diplomacy, strategy and intrigue. Source: about 2 years ago

For those who are interested in this kind of games, there's also the very promising Solaris: https://solaris.games. Source: about 2 years ago

Not to be confused with Pioneer Spacesim, the remake of Elite 2, a free online game https://pioneerspacesim.net/. - Source: Hacker News / about 1 year ago

Pioneer space sim https://pioneerspacesim.net/ Crashes when entering multiple star systems for me. Source: almost 2 years ago

I found the flight mechanics of Pioneer space sim to be realistic. https://pioneerspacesim.net/. Source: almost 2 years ago

Fans of the game have made games - see pioneer. https://pioneerspacesim.net/ - this should give you an inkling of what is possible compared to what you might wish. Source: over 2 years ago

Probably Elite. Specs are sadly below the minimums for the modern incarnation of Elite Dangerous, but Oolite and Pioneer are free open-source takes on the first and second games of the series that are worth suggesting to him even if it doesn't help get you a present. Source: over 2 years ago