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

Gamefromscratch

Mike from Game from Scratch discusses three Humble Bundles currently available, featuring assets for both Unity and Unreal Engine. Highlights of the bundles include the Supreme Unreal and Unity gamedev bundles, a stylized cartoon assets bundle, and the ultimate music production bundle from IK Multimedia. These bundles offer professional licenses and a variety of assets, including environments, characters, and VST instruments for music production, making them a valuable resource for game developers and musicians.

3(?!?!) HUGE Game Development Humble Bundles