TripleA - TripleA is a free (under GPL) turn based strategy game based on Axis & Allies board game.
Dead Frontier - Dead Frontier is among the few zombie based video games that you can obtain in your web browser and for free.
Lux Delux - Lux Delux is a game of strategy and domination inspired by the board game Risk.
7 Days to Die - 7 Days to Die is a post-apocalyptic survival game, during which players must craft shelters and horde resources in order to survive waves of undead enemies. Read more about 7 Days to Die.
Streets of Chaos - Streets of Chaos is a Puzzle, Tactical, Turn-based Strategy and Single-player Simulation created by SimProse Studios.
DayZ - DayZ is an open world multiplayer survival game that tosses you in the midst of a zombie apocalypse.