You might be interested in nationstates.net, whose primary shtick is geopolitical roleplay on the forums. Source: 12 months ago

Sorta. It's similar to http://nationstates.net. Source: almost 2 years ago

That would be quickly exploited by people who know how to make bot accounts and control them on large scales. It would turn into nationstates.net raids in mere days. Source: about 2 years ago

The closest thing I've done is to mock up some nationstates.net -like dilemmas for my players when they were running a castle and started attracting settlers. Source: about 2 years ago

This is our Reddit. We are a small region at nationstates.net. We are hoping to expand with social media. Check out our region at https://www.nationstates.net/region=the_region_of_worshipping_doggos. Source: about 2 years ago

Well how about I introduce you to... FreeCiv! https://freeciv.org/. - Source: Hacker News / 6 months ago

There are many other commercial projects similar to this (colonist.io landover.io etc). None of them are open source though. This has been done in the past extensively (see freeciv.org, or Terasology, or 0 AD etc). Source: 7 months ago

While many CivFanatics have probably heard of FreeCiv and Civ2Clone, there is also another freely available opensource indie game inspired by Civilization 2 called C-evo! C-evo aims to recreate the classic mid 90s TBS Civ2 like experience, but with more emphasis on a custom military unit designer, extremely powerful/deadly AI, and careful design of the rules, resulting in a true challenge. The game uses similar... Source: 7 months ago

FreeCiv uses its own FOSS engine[0], can keep you occupied for days. [0] http://freeciv.org/. - Source: Hacker News / 8 months ago

The client and server are separate binaries; they are released together on freeciv.org, but Linux distributions put them into different packages. Source: 11 months ago