X-COM - X-COM is a Science-Fiction, Turn-base Tactics, Strategy and Single-player video game series developed by Mythos Games and published by MicroPose.
FTL: Faster Than Light - FTL is a spaceship simulation roguelike-like.
Xenonauts - Xenonauts attracts greatly on the sci-fi universe of the original X-COM to make a very familiar turn based tactical adventure.
Kingsway - A retro RPG built into an operating system
Battle World: Kronos - Battle World: Kronos is a Turn-Based Real-Time Strategy (RTS) game along with a battle structured video game developed by KING Art.
Crying Suns - Tactical rogue-like casting players as a space fleet commander.