Godot is probably the best choice for open source game engines. Its got funding and full time developers working on it.
Stride3D is probably the closest open source clone of Unity. It was developed by Silicon Studio as a commercial game engine but they eventually stopped and open sourced it. Its got a ton of modern features including vulkan and direct x 12 support. It has an active community too, but no full time staff making new features.
Godot is probably the best choice for open source game engines. Its got funding and full time developers working on it.
Stride3D is probably the closest open source clone of Unity. It was developed by Silicon Studio as a commercial game engine but they eventually stopped and open sourced it. Its got a ton of modern features including vulkan and direct x 12 support. It has an active community too, but no full time staff making new features.