FOSS 4X game with very competent AI

[CaffeineAddict]

4X genre stands for Explore, Expand, Exploit, Exterminate

freeorion is galactic conquest game where you play one of the available species and your goal is to dominate the galaxy and up until you research the ultimate and expensive technology that makes you win the game.
You build military ships, research technologies, colonize planets, terraform planets, manage economy, engage in diplomacy with other species (AI's) in galaxy etc.

The AI is exceptionally good becauase in 4X games AIs are known to be bad due to complexity of gameplay.

The game is cross platform, open source, exists for a very long time, it is written in C++ and scripted in Python, UI is based on OpenGL.

FreeOrionWiki

GitHub - freeorion/freeorion: Source code repository of the FreeOrion project.

Source code repository of the FreeOrion project. Contribute to freeorion/freeorion development by creating an account on GitHub.

github.com

 

[Detelpa725]

Check out FreeCiv or 0 A.D. Both are free, open-source strategy games with solid AI. FreeCiv is a Civilization clone, and 0 A.D. is more like Age of Empires. The AI in both can put up a decent challenge, especially if you tweak the difficulty settings. They’re not Stellaris-level deep, but they’re great for scratching that 4X itch without spending a dime.

 

[CaffeineAddict]

Check out FreeCiv or 0 A.D. Both are free, open-source strategy games with solid AI.

FreeCiv's UI is too bad for my taste and clumpsy but 0 A.D was already considering, looks good, need to compile it from source though to get latest version.
thanks for suggestion.