Stride

Verdict: Open-source C# game engine (formerly Xenko) with a full editor for realistic 3D games. No built-in AI; its C# scripting works well with AI coding assistants.

Free (MIT open source) · Official site: https://www.stride3d.net · source checked 2026-10-22 (HTTP 200)

GitHub repo · ★ 7.9k stars (as of 2026-10-22) · More open-source AI

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