Zero-K
Full user review
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"Dynamic, Epic Scale RTS with realistic physics."
Pros
Free.
200+ unique units.
3d heightfield terrain that can be terraformed, cratered by projectiles, and deformed.
Physics engine for projectiles and unit collisions in large explosions.
Epic scale with massive armies and no unit limits.Cons
No singleplayer campaign, only AI skirmish and online multiplayer.
Graphics arent state of the art, but good for open source.
Challenging RTS gameplay and high online skill ceiling.Summary
Play it! It's free, why not?