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OpenRA
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.
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InfluxDB
Power Real-Time Data Analytics at Scale. Get real-time insights from all types of time series data with InfluxDB. Ingest, query, and analyze billions of data points in real-time with unbounded cardinality.
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Spring RTS game engine
A powerful free cross-platform RTS game engine. - Report issues at https://springrts.com/mantis/ (by spring)
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OpenRA-Install-Guide
A complete installation guide including the music missing from the OpenRA Dune 2000 mod
You can import those from ISOs: https://github.com/OpenRA/OpenRA/wiki/Game-Content but the campaign is not complete afaik as it needs to be re-built in OpenRA: https://github.com/OpenRA/OpenRA/issues/4989 (I think this is the related ticket)
May I present, Beyond All Reason - https://www.beyondallreason.info/
Like OpenRA it's open source too.
Disclaimer, I'm one of the devs for it.
...or Total Annihilation Spring, nowadays known as Spring RTS: https://springrts.com/
All the art and sound assets come from a legally purchased copy of C&C, specifically the "C&C Remastered Collection" on Steam or Origin. OpenRA uses the assets from that, so it's all legal! Stratagus does the same thing with Warcraft assets.
https://github.com/OpenRA/TiberianDawnHD#asset-installation
Recoil (previously called Spring) - https://github.com/beyond-all-reason/spring