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Game · Strategy

Freeciv21

Develop your civilization from humble roots to a global empire.

  • Completely free
  • Linux
  • Open source

Overview

Freeciv21 is a turn-based strategy game, available on Linux.

Gameplay elements described in its Flathub listing and in its GitHub repository: turn-based play and play against the computer.

Overview written by LicitPro from the documentation published by the authors and the cited sources; we have not tried the resource ourselves.

Excerpts that establish this information
  • “Freeciv21 is a free open source turn-based empire-building 4x strategy game, in which each player becomes the leader of a civilization.” — GitHub, 10 November 2026
  • “Freeciv21 is a free open source turn-based empire-building 4x strategy game, in which each player becomes the leader of a civilization.” — Flathub, 10 November 2026
  • “Players can choose from over 500 nations and can play against the computer or other people in an active online community.” — Flathub, 10 November 2026

At a glance

Freeciv21 is completely free: it is open source software, and every feature is available without paying or subscribing.

Its licence (GPL-3.0+) is a copyleft open source licence: you may use, study, modify and redistribute it, including commercially; modified versions must keep the same licence.

Strengths

  • Open source code
  • Commercial use allowed

About

Freeciv21 is a free open source turn-based empire-building 4x strategy game, in which each player becomes the leader of a civilization. You compete against several opponents to build cities and use them to support a military and an economy. Players strive to complete an empire that survives all encounters with its neighbors to emerge victorious. Play begins at the dawn of history in 4,000 BCE. Freeciv21 takes its roots in the well-known FOSS game Freeciv and extends it for more fun, with a revived focus on competitive multiplayer environments. Players can choose from over 500 nations and can play against the computer or other people in an active online community. The code is maintained by the team over at Longturn.net and is based on the QT framework. The game supports both hex and square tiles and is easily modified to create custom rules.

Description from Flathub — AppStream (Flathub)

Sources and checks

  • Facts collected from Flathub (credit card, source code, publisher, licence, free status, platforms, commercial use, version) —
  • Last technical check: 7 November 2026
  • Description from Flathub — AppStream (Flathub)

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