Blender - Blender is the open source, cross platform suite of tools for 3D creation.
Open Peeps - A hand-drawn illustration library.
Cinema 4D - Cinema 4D is a 3D modeling, animation, motion graphics and rendering application.
Control Illustrations - 108 free flat illustrations with customizable characters
V-Ray - Learn why V-Ray for 3ds Max’s powerful CPU & GPU renderer is the industry standard for artists & designers in architecture, games, VFX, VR, and more.
Craftwork - A collection of User Interface resources made by Craftwork