SpellForce (Series)!

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…

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.

MegaGlest is an open source 3D-real-time strategy game, where you control the armies of one of seven different factions: Tech, Magic, Egyptians, Indians, Norsemen Persian or Romans. The game is setup in one of 14 naturally looking settings, which -like the unit models- are crafted with great appreciation for detail.

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. »

Stonehearth is a game about exploration and survival in an epic fantasy setting. Your job is to help a small group of settlers survive and carve out a place for themselves in a hostile land. You’ll need to establish a food supply, build shelter, defend your people, and find a way to grow and expand, facing challenges at every step.

Free (as in freedom) open-source RTS http://alternativeto.net/software/age-of-empires-iii/ engine. Written from scratch in C++14 and Python, using OpenGL + GLSL.

Runescape is the most popular free MMO in the world, by Jagex Games Studio. Complete quests and win enormous treasures in a 3D world full of magic and monsters- all while never leaving your internet browser.

Project Nomads is a computer game by Radon Labs released in 2002. It is set on the fictional planet Aeres, a fantastic world of gigantic floating islands, which are the remnants of the planet from before it exploded. After Aeres broke apart, the few surviving inhabitants settled on the drifting fragments of the planet. You are a nomad, a restless soul forever in pursuit of adventure. You wander across the planet on your island, discovering mysterious artifacts and exploring the ruins of the long dead race of Master Builders. The only place to fall to is the Sea of Flames, the very bottom level of this new world. »

In the heart of the rainforest, a stunning view opens up to a white limestone city - your city in Tentlan. Travel back to mysterious cultures, become a mighty emperor, and experience the maya civilization in your own skin!