OpenCiv1: Open Source Rewrite of Civilization 1 (1991) Hits 430 Stars on GitHub

A Classic Reborn

OpenCiv1 recreates Sid Meier's legendary Civilization 1 (1991) from scratch, making it cross-platform and copyright-free.

Technical Details

• Stack: .NET 8 + Avalonia UI framework
• Platforms: Windows, Linux, macOS
• Approach: Assembly code emulated via Virtual CPU, rest rewritten in C#
• Status: Working state (requires original game files)
• License: MIT

Key Difference from FreeCiv

Unlike FreeCiv, which diverged significantly from original gameplay, OpenCiv1 preserves all original rules and functionalities while being completely copyright-free.

How to Contribute

1. Testing: Play and submit bug reports
2. Code Translation: Translate pseudo-assembly to native C#
3. Visual Themes: Design SVG graphics and MIDI soundfonts

No original source code is included — Microprose never released it. All code is rewritten from scratch. The project has gained significant traction with 430 GitHub stars.