Free and Open Source Software

Even though the polygons don't exactly merit much of a second look, I'm shocked by how smoothly it runs and just generally how well-implemented the engine is. Especially with the incredible diversity of the different factions, it sort of feels like a more relaxed but still tactical WarCraft 3-like RTS. You have gold, wood, stone, and a food quota to manage, but some factions function so differently; one sort of copies StarCraft's Zerg or Protoss in the way that it has existing units irreversibly upgrade and specialize in specific forms, and another summons some units on the fly instead of at a base building.

I also see that it's extremely moddable and some people tried to make sci-fi total conversions, but I unfortunately see none that have had any recent work (sci-fi's really my jam).

Has anyone else tried this cross-platform FOSS game? It's great!