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InfluxDB
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ZeroEngine was an engine that was used at DigiPen university to teach game development. It was open sourced but the development eventually died. Even though it is not actively being developed, the technology is quite good. At some point, one of the former developers forked the engine to make it cross platform. He got it running on Linux, and Emscripten, in addition to windows that was already working. The forked project is located here: https://github.com/WelderFoundation/WelderEngineRevamp
There is a lot of documentation available for the engine (https://zero.digipen.edu/) as well as https://github.com/zeroengineteam/ZeroDocs
If you would like to check it out, I have a build here: https://github.com/WelderUpdates/WelderEngineRevamp/releases/tag/v0.0.25.2132