Godot Engine 
Some news of #GodotEngine 3.0: alpha 2 was released 2 weeks ago (https://godotengine.org/article/dev-snapshot-godot-3-0-alpha-2), and since then Bullet has been integrated as default 3D physics engine!
Current focus is on reviewing and merging the current pending PRs before the feature freeze next Monday; then comes 3.0 beta, and the final release shouldn't be far away.