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A desktop reimplementation of the two classic X-COM games, with support for additional mods.
Before you start
- Platform
- Windows / macOS / Linux
- How to start
- Download
- Game files
- Bring game files
File requirements
Requires unmodified original data from UFO: Enemy Unknown or Terror from the Deep. The Windows installer can extract resources from your owned Steam copy.
Based on public documentation; full builds and playthroughs have not been tested. Project documentation 
What it recreates
OpenXcom reimplements UFO: Enemy Unknown and Terror from the Deep, focusing on the two classic X-COM games rather than the modern XCOM series.
What’s different
It brings the classics to modern Windows, macOS and Linux systems, with additional mods available to expand the experience.
What you can use today
Desktop releases require unmodified original data from either game. The Windows installer can extract assets from your owned Steam copy; additional mods may have their own asset requirements.
Sources & notesSources checked:
The README identifies both original games and their data requirements; src/main.cpp explicitly states GPL version 3 or later.
Source Project documentation Project GPL-or-later notice Sources checked: 2026-10-12 · Based on public documentation; full builds and playthroughs have not been tested.