Hands-On with Leartes Studios Unreal & Unity Assets Giga Bundle:
https://www.humblebundle.com/software/leartes-unreal-and-unity-assets-giga-bundle-software?partner=gamefromscratch

This bundle contains a large number (61!) of assets for a mix of Unreal and Unity game engines, as well as a couple of tools and a tutorial or two in the mix. The bundle is mostly environments, props and characters though and *most* are redeemed on the Leartes Cosmos store.

Links
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https://www.humblebundle.com/software/leartes-unreal-and-unity-assets-giga-bundle-software?partner=gamefromscratch
https://gamefromscratch.com/leartes-studios-unreal-and-unity-assets-giga-humble-bundle/

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!).