OpenXcom.org and Ufopaedia.org are now being hosted by StrategyCore. You might remember them as one of the first X-COM fansites, so I guess we’ve come full circle.

Milestones Nightlies Extras A new milestone is coming soon! Use the latest nightly instead.

OpenXcom is an open-source clone of the original UFO: Enemy Unknown (X-Com: UFO Defense in USA), licensed under the GPL and written in C++ / SDL. It was originally founded by …

OpenXcom Data Patch Translations The OpenXcom translations are fan-maintained and update at a completely different pace from the milestone/nightly builds, so it’s impossible for us to …

Milestones Nightlies Extras These builds are automatically generated from the codebase, use these to try the latest features or check if a bug is obsolete. Do not install these on top of 1.0! …

1 day ago · Explore released mods for OpenXcom, including child boards and community creations, to enhance your gaming experience.

1 day ago · OpenXcom Forum - IndexHaving trouble with your mod? Don't know how to get started? Ask for help here!

6 days ago · Explore the X-Com Files mod on OpenXcom forum, featuring discussions, updates, and insights into this popular modification.

Feb 3, 2017 · Based on OpenXcom nightly build from: 2025-12-07 (commit 4af088c) If you haven't found a download package for your platform, you can build your own directly from the …

You can also still find old development screenshots archived for posterity.