3(?!?!) HUGE Game Development Humble Bundles
Humble Bundle are running not one, not two, but THREE different game development Humble Bundles. For Unreal Engine, Unity, even Blender (and Godot) directly in one case, they redeem on Fab and on Unity Asset Store, as well as a VST oriented bundle for musicians.
Links:
Supreme Unreal & Unity GameDev - https://humblebundleinc.sjv.io/SupremeUnrealAndUnityBundle
Stylized Cartoon Assets - https://humblebundleinc.sjv.io/StylizedCartoonAssetBundle
Ultimate Music Production - http://humblebundleinc.sjv.io/UltimateMusicProductionBundle
GFS Link - https://gamefromscratch.com/3-huge-gamedev-humble-bundles/
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