The models are extremely lightweight and can easily be used in games, animations, designs, visualizations, AR, VR, holograms etc. Models are provided in .fbx & .blend formats and can be imported into most 3d packages.

They are usable in all independent and commercial projects - and are designed to help artists learning 3d, independent animators, designers and game creators.  

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All models use Vertex Colors as their color/diffuse base, and sometimes use vertex alpha for transparency. For Blender, you need to create a material using the Vertex Color Node. 

You can also select “Toggle Display Colors Attribute”.

https://www.davidoreilly.com/library