OpenRA is a free Open Source RTS (Real Time Strategy) game based on the game Command & Conquer: Red Alert.
The original game dates back from 1996 and is made by Westwood Studios. During the release of Red Alert 3 had EA decided to make Command and Conquer: Red Alert as freeware.
OpenRA has been made a copy of the original game, and is still being actively developed. For example, in OpenRA, among other modern display resolutions supported and there is also cross-platform against each other to be played. Also contains OpenRA standard many new units that the original game only later were added in the expansion packs "Counterstrike" and "The Aftermath".
In addition to multiplayer, of course there are also single player missions available. You can also play in skirmish mode against computer-controlled opponents.
The game is available on Windows, OS X and many Linux distributions.
In addition to C&C: Red Alert contains OpenRA C&C Tiberian Dawn (the first Command & Conquer), and Dune 2000.
You can free download OpenRa and safe install the latest trial or new full version for Windows 10 (x32, 64 bit) from the official site.