Freeciv is a Free and Open Source empire-building strategy game inspired by the history of human civilization.

Features

• Generally comparable with Civilization I & II.
• Up to 126 players!
• Artificial Intelligence (AI) computer-controlled players.
• Internet & LAN multiplayer (TCP/IP).
• Support for a great number of platforms.
• Premade maps & scenarios!
• More than 50 playable units and 541 nations.
• Modpack support!
• Internationalization (i18n): translations for many languages available.
• In-game help system.