OpenRA is an Open Source real-time strategy game engine for early Westwood games such as Command & Conquer: Red Alert. Developed by OpenRA developers
License: Open Source
The Age of Empires series offers a rich historical experience with a variety of civilizations and content, but comes with higher system requirements and costs. OpenRA, on the other hand, is a free, open-source alternative that captures classic RTS gameplay but may lack the depth and polish of commercial titles.