OpenCiv1 – open-source rewrite of Civ1

https://github.com/rajko-horvat/OpenCiv1

GitHub - rajko-horvat/OpenCiv1: Open source rewrite of the original Civilization 1 Game designed by Sid Meier and Bruce Shelley in year 1991

Open source rewrite of the original Civilization 1 Game designed by Sid Meier and Bruce Shelley in year 1991 - rajko-horvat/OpenCiv1

GitHub
There are also some folks working on a similar project for Civilization 2. https://github.com/axx0/Civ2-clone