4X topic
4X is a genre of video game that focuses on strategic decision-making and long-term planning. Players control an empire and must “explore, expand, exploit, and exterminate” in order to succeed. 4X games are known for their depth and complexity, with players needing to manage resources, research technologies, build armies, and make diplomatic decisions in order to progress. Some popular examples of 4X games include the “Civilization” series and “Europa Universalis”. Whether you are a seasoned strategy gamer or just getting started, 4X games offer a rich and rewarding gaming experience.
OpenCiv
An open source civilization-like game made for the web browser.
freeciv21
Develop your civilization from humble roots to a global empire
glsmac
Unofficial open-source OpenGL/SDL2 reimplementation of Sid Meier's Alpha Centauri ( + Alien Crossfire )
stars-nova
Clone of the classic 4X game Stars!. Fork of original svn repo on SourceForge.
thinker
AI improvement patch for SMACX.
OpenCiv1
Open source rewrite of the original Civilization 1 Game designed by Sid Meier and Bruce Shelley in year 1991