Procedural Landscape from Shader Graph w/ Geometry Clipmaps BP/C++

The latest version is available as a plugin 4.26+ compatible, supports spawning of any actor you want.

You can also use landscape layers to define asset spawning and multiple procedural world can share their generated data between each other:
Ocean can access the terrain height from the Land world.

Any actor spawning is pretty cool, you can spawn VFX, NPCs, anything you want really.