Newly released is Arcane Fortune, a free game inspired by Civilization and SimCity with their ultimate goal to have the same 'detail and realism as Dwarf Fortress'.
In the developers own words, "Arcane Fortune is a game of empire building, diplomacy, conquest, construction, and deconstruction. Whether or not you build some form of paradise, or a hell on earth is entirely up to you". It has an absolutely huge scope to include the handling, managing and instigating social and political turmoil in your and other empires. Even further out they want to make a formidable AI, with the help of 'deep-learning techniques'.
You can play it entirely in a terminal of your choice too, simply download it and then run it in terminal to begin. So you can probably make it look pretty wild with some of the retro terminal apps out there.
So far, it seems like it has a lot of good ideas and the interface is actually quite good for a terminal-based experience. I didn't have any trouble getting around it, although the beginner's guide helps with that. Sounds like things get pretty wild as you progress through it, especially with the technology tree—eventually you can get uranium and ICMB-loving civilizations might end up wiping each other out…or you. You definitely get the classic Civilization vibes from it but with the zoning elements of SimCity to end up making something like neither of them. I can feel the next time-sink coming on.
While it's not open source, it does have a reasonably permissive license allowing you to distribute it and modify it under the CC BY-NC-SA 4.0 license.
Find out more and download on the official site.