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

> The game is still very popular and easy to play. But the obsoletness of DOS

Nothing obsolete about DOS when it comes to playing 2D games. Thanks to DOSBox and other emulators (FreeDOS is also not bad though) it is a fantastic OS (or virtual machine). DOS as a platform for (2D) games has never been better than it is today, on modern hardware running DOSBox.

There is a win 3.1 port for wider screens that do box will run
While not exactly the same, there is also https://www.freeciv.org/
Freeciv.org - open source empire-building strategy game.

Freeciv is a Free and Open Source empire-building strategy game inspired by the history of human civilization. The game commences in prehistory and your mission is to lead your tribe from the Stone Age to the Space Age.

Also worth mentioning is C-evo, even if it's not being developed further afaik

http://c-evo.org/

C-evo, Empire Building Game

C-evo is a freeware empire building game for Windows

There are also some folks working on a similar project for Civilization 2. https://github.com/axx0/Civ2-clone
I love how obsessed HN is with civilization. I put over 1000 hours into Civ 5 alone and was proud to beat diety (and then consistently beat diety). It's funny how many founders are big on civ. Zuck and Elon both apparently spent a lot of time during college on the series.
Is there anything similar for Civ IV? So many top tier mods break after a while due to the same memory issues.