The upcoming version Godot 4.0 is on par with Unity, with several 2D and 3D subsystems (physics engine, lighting, 2d grid...) being rebuilt in full. It's getting traction in terms of tutorials and courses [1], and several publishers paying attention (e.g. Valve making sure that the Steam Deck will be supported).

[1] For example https://www.kickstarter.com/projects/gdquest/learn-to-code-f..., an already financed Kickstarter to build an open source course and companion app.