Good open source 2d RTS game?

I want to look at a good open source 2d RTS game to learn a bit. You guys know of a good one?
Warzone 2100.
Was initially a closed source, but some time ago sources were released to public. It is community developed right now.
Main site: http://wz2100.net
Source: http://github.com/Warzone2100
Last edited on
Thank you, helpful peer!
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