That isn't a game engine, but some scripts that run on the Source 2 engine, which isn't open-source.
this post was submitted on 26 Nov 2025
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It's a heavily modified and upgraded version of source 2, but yeah.
source available. Lots of non free components make this not open aource, but cool nonetheless (you still need someone elses permission [source 2, steam, and almoat certainly other dynamically linked libraries] to make this work, which goes against the definition of open source)