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ReSharper
ReSharper is now available in VS Code and Cursor. ReSharper brings a professional toolset for C# developers backed by over 20 years of experience, enterprise-grade security, SOC 2 compliance, and the trust of companies worldwide.
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Probably not much in the AA/AAA space, but plenty of indies. The Doom engine (and GZDoom, which is the most common Doom engine derivative) is GPL and there have been multiple commercially successful games released using it. I know at least Hedon[0] and Hands of Necromancy[1] sold enough copies to warrant a sequel.
[0] https://github.com/madame-rachelle/hgzdoom https://store.steampowered.com/app/1072150/Hedon_Bloodrite/
[1] https://store.steampowered.com/app/1898610/Hands_of_Necroman...
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Go and have a look at Bepu Physics v2: https://github.com/bepu/bepuphysics2
It can be quite performant these days, sadly I'm stuck developing in Unity Mono C# which is quite a bit behind.