The Unreal Engine and Unity Mega Humble Bundle:
https://www.humblebundle.com/software/unreal-engine-and-unity-mega-bundle-software?partner=gamefromscratch

This bundle is a large collection of 3D environments from Hivemind, for both Unreal Engine and Unity. As you can see from the many links below you can export these models out to be used in other game engines like Godot or generally to applications like Blender.

Links
https://www.humblebundle.com/software/unreal-engine-and-unity-mega-bundle-software?partner=gamefromscratch
https://gamefromscratch.com/unreal-engine-and-unity-mega-bundle/

The above links contain a code that enables you to direct a portion of your purchase to support GFS (and thanks so much if you do!)

Asset Guides:
*Is It Legal to Use Unreal Engine Assets in Unity or Godot and Vice Versa:*
https://gamefromscratch.com/using-asset-store-assets-in-other-engines-is-it-legal/

*Unreal to Godot, Blender or Unity:*
https://gamefromscratch.com/exporting-from-unreal-engine-to-godot-unity-or-blender/

*Moving From and To Unity in Minutes*
https://gamefromscratch.com/moving-from-and-to-the-unity-game-engine

(More guides in the linked article above!)

The above links contain a code that enable you to direct a portion of your purchase to support GFS (and thanks so much if you do!).