The Epic Adventure Asset Mega Pack:
http://humblebundleinc.sjv.io/EpicAdventureAssetPack

This bundle contains a large collection of gamedev assets for mostly Unreal Engine (a few also work in Unity) all redeemed on the Epic Games Fab marketplace (yes… one by one). Assets include 3D environments, characters, vehicles, props and … dinosaurs?

Bundle Link: http://humblebundleinc.sjv.io/EpicAdventureAssetPack
GFS Link: https://gamefromscratch.com/epic-adventures-asset-mega-pack/

Using the above links helps support GFS (and thanks so much if you do!).

Guides to Import/Export Assets Between Engines
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*New Unreal to Godot Convertor*
https://gamefromscratch.com/unreal-to-godot-amazing-new-exporter-tool/

*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