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UF

UFO: Alien Invasion

Open-source strategy game of defending Earth from aliens

Game Servers ★ 167 stars Easy setup GPL-2.0

UFO: Alien Invasion is a free, open-source strategy game in which the player commands a secret organization defending Earth from alien invaders, combining base management with turn-based tactical combat. It is inspired by the classic X-COM series.

Official siteSource code

Key features

  • Base management and tactics
  • Turn-based combat
  • X-COM inspired gameplay
  • Open-source assets

Strengths

  • Released under the GPL-2.0 license
  • Easy to set up — beginner-friendly
  • Written in C++
  • Lightweight — runs in 512 MB RAM

Is UFO: Alien Invasion secure?

OSV.dev has no published security advisories for UFO: Alien Invasion's repository. No known vulnerabilities is not proof of security: it means none have been publicly catalogued.

Source: OSV.dev, checked 2026-10-14. How this is measured.

UFO: Alien Invasion replaces

Self-hosted XCOM alternatives

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