Godot 4, which is still in alpha-testing phase (currently alpha 7), does not yet have the terrain plugin and most of the other useful modules from Godot 3. However, in just a couple of weeks, the developer managed to create his own implementation of a very convincing forest .
It took almost two years for the original idea to come together: Godot Engine version 4.0, as well as 3.4 will have the full support for 64-bit files and computations. This means that instead of 2.1 Gigabytes, you will be able to use files up to 9.2 · 10⁹ Gigabytes in size.
Free and Open-Source Godot Engine now supports a new amazing lighting system, that will allow developers to create fully dynamic outdoor illumination. It's called SDFGI (signed distance field cascades global illumination) and offers a balance between quality and performance by dividing the screen space to distance cascades with different accuracy.