Stonehearth!

0 A.D. is a free, open-source, cross-platform real-time strategy (RTS) game of ancient warfare. In short, it is a historically-based war/economy game that allows players to relive or rewrite the history of Western civilizations, focusing on the years between 500 B.C. and 500 A.D. The project is highly ambitious, involving state-of-the-art 3D graphics, detailed artwork, sound, and a flexible and powerful custom-built game engine.

Set a generation before the events of the original Warcraft began, Warcraft II is a real-time strategy game by Blizzard Entertainment. Cunning, sinister, and seemingly unstoppable, the demonic Burning Legion prepare to launch their long-awaited assault on the mortal world. Survival is a matter of strategy, as the Reign of Chaos begins…

Dwarf Fortress is a single-player fantasy game. You can control a dwarven outpost or an adventurer in a randomly generated, persistent world. The world is randomly generated with distinct civilizations spanning centuries of detailed history, hundreds of towns, caves and regions with various wildlife. The world persists as long as you like, over many games, recording historical events and tracking changes.

Terrestrial colonisation station building game, quite similar in the Dwarf Fortress

In this city-building strategy game, you control a group of exiled travelers who decide to restart their lives in a new land. They have only the clothes on their backs and a cart filled with supplies from their homeland.

The Fun-Focused Free Software Voxel World Game.

Age of Mythology is based on building towns, gathering resources, creating armies, and ultimately destroying enemy units and buildings. In this way, players are able to defeat and conquer rival towns and civilizations. Players advance their tribe through four "Ages": starting in the Archaic Age, the player may upgrade to the Classical Age, the Heroic Age, and finally, the Mythic Age. Each upgrade to a higher Age unlocks new units and technologies for the player, which strengthens their settlement. »

Cube World is a 3D action RPG currently in development for PC. It features a huge procedurally generated world made up of cubes!It may look like another Minecraft clone but this is more down to exploration. Find roads leading to a village. Get quests and talk to NPC's. Its inspiration mainly comes off of Legend of Zelda, but open world.

You are marooned on the shores of an infinite blocky world. Explore, mine resources, craft tools and weapons, hunt and make traps. Build a shelter to survive nights and share your worlds online. Possibilities are infinite in this sandbox survival and construction game.

Gnomoria is a sandbox village management game where you help lead a small group of gnomes, who have set out on their own, to thrive into a bustling kingdom! Anything you see can be broken down and rebuilt elsewhere. Craft items, build structures, set traps and dig deep underground in search of precious resources to help your gnomes survive the harsh lands. Build your kingdom and stockpile wealth to attract wandering gnomads to your cause, but be wary of also attracting enemies!