War Selection is a free to play Early Access RTS now available for Linux

Currently in Early Access, War Selection from Glyph Worlds is a somewhat promising looking real-time strategy game and they just released it for Linux officially.

War Selection is free-to-play RTS with apocalyptic 62-player battles

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War Selection is a free to play Early Access RTS now available for Linux

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Cross-Platform RTS Game 0 A.D. Alpha 21 Available For Download ~ Web Upd8: Ubuntu / Linux blog