The Battle for Wesnoth - Turn-based strategy game with a high fantasy theme. Unknown Horizons - 2D isometric RTS economic strategy game written in C++ & Python, built on the Flexible Isometric Free Engine. Voxeliq - Block-based game engine implementation developed with C#. Warzone 2100 - Post...
The Spectre Update is live now for Warzone 2100, the real-time strategy game originally developed by Pumpkin Studios and published by Eidos Interactive that's nowadays free and open source. Absolutely great strategy game, I can't tell you of my joy being able to play this easily ...