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OpenSAGE
OpenSAGE is a free, open source re-implementation of SAGE, the 3D real time strategy (RTS) engine used in Command & Conquer: Generals and other RTS titles from EA Pacific. Written in C#. Not affiliated with EA.
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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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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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SaaSHub
SaaSHub - Software Alternatives and Reviews. SaaSHub helps you find the best software and product alternatives
There is an open source project that aims to make compatibility with modern systems better: https://github.com/OpenSAGE/OpenSAGE
If you just want to play RCT, buy one or both, and then go get OpenRCT2, which is an open-source implementation of RCT2 with new features, bug fixes, etc. OpenRCT2
OpenRA.net for anyone looking for a free fan made version of Red Alert with some QoL improvements.