MegaGlest!

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…

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. »

CaesarIA is an open source remake of Caesar III game released by Impressions Games in 1998, it aims to expand the possibilities of the classical city-building simulators and to add new features showing the city life. Now the game work with Windows, Linux, Mac, Haiku and Android.

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.

Bos Wars (formerly known as Battle of Survival) is a futuristic real time strategy game (RTS). It is possible to play against human opponents over LAN, internet, or against the computer.

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. »

LandGrabbers, recognized as the Best Casual Game of the Year at the 2011 Russian Game Developers Conference (KRI 2011)!