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Battle for Wesnoth (FREE)
Based on the SEGA Genesis game Warsong (known as Langrisser in Japan), The Battle for Wesnoth is a turn-based strategy game that proves that dedicated communities with a strong focus can produce great games. Wesnoth is open-source and cross-platform, and anybody can contribute new artwork, units, or campaigns. Much of the work that is bundled with the official releases of the game are user-created. Developers of the game include the co-founder of the Open Source Initiative, Eric S. Raymond, and other well-known open source pioneers.