Xenowar

Xenowar is an open source turn-based strategy game in the vein of X-COM, with a low-poly graphics style.

The game is heavily modelled after the original X-COM, with two main parts, the geoscape view where the player manages their bases, research, production and command their aircraft (to intercept UFO's or transport troops to missions), and the tactical view where they command their troops in turn-based combat.