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
Stronghold is a historical real-time strategy series focused on castle building and resource management, offering rich single-player campaigns and multiplayer modes. In contrast, OpenRA is an open-source project that revives classic RTS games, providing cross-platform play and extensive modding options, but may lack the depth and historical context found in Stronghold.