OpenRA: Open-source RTS game engine for games such as Command and Conquer

• OpenRA

  256 14,143 9.6 C#

  Open Source real-time strategy game engine for early Westwood games such as Command & Conquer: Red Alert written in C# using SDL and OpenGL. Runs on Windows, Linux, *BSD and Mac OS X.

  

Looks like a clean-room implementation [1]

[1] https://github.com/OpenRA/OpenRA/wiki/FAQ#is-that-legal

• 0ad

  142 2,650 9.1 C++

  Git mirror of the 0 A.D. source code (http://trac.wildfiregames.com/browser)

  

I can't say I've actually played the game itself much as I'm mostly casually looking to add an economic mod to make it more similar to Anno1800/Settlers. :) I do recall you can win easier by taking over competiting towns. The nice part is that there's less risk for your friends since they don't have to buy anything. Just be be sure you're on the same version.

There are some Youtube videos by Nookrium and Tom 0ad

https://www.youtube.com/channel/UCS-SFei6NFRuGN8CKtAsYrA

Interestingly the base game itself is implemented as a huge mod and is mostly JS, so if you're willing to go spelunking.

https://github.com/0ad/0ad/blob/master/binaries/data/mods/pu...

https://github.com/0ad/0ad/blob/master/binaries/data/mods/pu...

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• CnC_Remastered_Collection

  22 18,058 0.0 C++
  

They licensed it under the GPL3 so it's free software. You can also get it also from EA's GitHub:

https://github.com/electronicarts/CnC_Remastered_Collection

They only related the source to the game logic, not the full engine.

And if course, the game data is not free.

• teiserver

  138 40 9.7 Elixir

  Middleware server for online gaming

  

• OpenTTD

  249 5,927 9.9 C++

  OpenTTD is an open source simulation game based upon Transport Tycoon Deluxe

  

• Vanilla-Conquer

  28 319 6.1 C++

  Vanilla Conquer provides clean, cross-platform builds of the C&C Remastered Collection and the standalone legacy games.

  

• hostile-takeover

  4 180 0.0 C

  Open Source Real Time Strategy game based on Warfare Incorporated

  

That is a fantastic game. Supposedly it's open source, though I haven't got it to compile and run that way.

https://github.com/spiffcode/hostile-takeover

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