PortedGames
Sid Meier's Civilization III cover art
Sid Meier's Civilization III. Sid Meier's Civilization III screenshot, via IGDB. Unofficial site, not affiliated with the publisher.
PC port · Windows → PC

OpenCiv3 (Civilization III fan remake)

An open-source, cross-platform, mod-oriented reimagining of Civilization III by the fan community, built in Godot and C#. It is pre-alpha: playable in a rudimentary way but missing many mechanics.

UnreleasedRemakeNeeds your own copyv0.3-dutch-2Updated

You need your own copy of Sid Meier's Civilization III. This port only runs with files from a copy you own; there is no download or play button here. No copy? These play in your browser right away, no files needed: BO1 Zombies (vel.gg), GTA 3 Online (quenq III Web), The Simpsons: Hit & Run WASM.

What you need

A 64-bit Windows, Linux or Mac computer; the project uses graphics from an original Civilization III install. It is pre-alpha: rudimentary, missing many mechanics.

Official releases ↗GitHub repository ↗

We do not host any files. Only download from the project's official source.

Every version of Sid Meier's Civilization III 1

  1. OpenCiv3 (Civilization III fan remake)This page

    UnreleasedRemake

    OpenCiv3 is an open-source, cross-platform, mod-oriented, modernized remake of Civilization III by the fan community built with the Godot Engine and C#, with capabilities inspired by the best of the 4X genre and lessons learned from modding Civ3.

    Runs on Windows (64-bit), Linux (x86-64), macOSNeeds files from a copy you own★ 6820.3-dutch-2 · Oct 31, 2026

    Website ↗

We link to each project's own page and host no game files. Version data from project pages, our daily checks and awesome-decomp-games (CC0).

Short answer

OpenCiv3 is an open-source, mod-oriented reimagining of Civilization III by the fan community, built in Godot and C#, for 64-bit Windows, Linux and macOS. It is pre-alpha: playable in a rudimentary way, but missing many mechanics and late-game content. Latest release: v0.3 “Dutch” 2, 31 October 2026.

This site is not affiliated with OpenCiv3, Firaxis, Take-Two or the other rights holders. We do not host any files and only link the project’s official pages.

What it is

Sid Meier’s Civilization III (2001) still has a dedicated modding community, mostly at CivFanatics.

OpenCiv3 (formerly codenamed “C7”) “is an open-source, cross-platform, mod-oriented, modernized reimagining of Civilization III by the fan community. Built with the Godot Engine and C#, with capabilities inspired by the best of the 4X genre and lessons learned from modding Civ3” (OpenCiv3 README). It is a remake rather than a port: the rules and engine are being rebuilt, not decompiled.

Current status

  • Pre-alpha: “It is a rudimentary playable game but lacking many mechanics and late-game content, and errors are likely.”
  • Latest release: v0.3 “Dutch” 2, 31 October 2026, for Linux, Mac and Windows. Release notes list new features per version.
  • Activity: very active (last update 2 November 2026); news on openciv3.org and the CivFanatics subforum.

What you need

  • A 64-bit Windows, Linux or Mac computer.
  • The release notes explain how to point it at an original Civilization III install for graphics; check them for the current version.

Should you try it?

If you want to follow and help shape a modern, moddable Civ III, yes. If you want to play Civilization III today, the official Complete edition is the way; OpenCiv3 is not a replacement yet.

FAQ

What is OpenCiv3?

An open-source, cross-platform, mod-oriented reimagining of Sid Meier's Civilization III by the fan community, formerly codenamed C7. It is built with the Godot engine and C#, and draws on lessons from years of Civ III modding.

Can I play a full game of Civilization III in OpenCiv3?

Not yet. The README says it is in a pre-alpha state, a rudimentary playable game that lacks many mechanics and late-game content, with errors likely.

What platforms does OpenCiv3 run on?

64-bit Windows, Linux and macOS, according to its README. Minimum hardware requirements are not yet defined; Godot's requirements are a guide.

Is OpenCiv3 affiliated with Firaxis or Take-Two?

No. The README states it is not affiliated with or endorsed by Firaxis, Take-Two or the other companies behind Civilization III.

Unofficial. This page is written by an independent directory. It is not made by, endorsed by or affiliated with Infogrames / Atari (developed by Firaxis; now Take-Two) or OpenCiv3 contributors (C7 Game) (OpenCiv3 (Civilization III fan remake)'s author). We do not host any files, and we never link to game files, ROMs or ISOs.

Sources

This page was last updated on Nov 3, 2026. A date after a source is the day we read it. Versions and steps follow the official project; if they differ, the official source wins.

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