Open Peeps - A hand-drawn illustration library.
Keyshot - KeyShot 3D rendering and animation software is the fastest, easiest way to create amazing, photographic visuals of your 3D models. Enter your search in the box aboveTryYour download of KeyShot is only moments away.
Control Illustrations - 108 free flat illustrations with customizable characters
Blender - Blender is the open source, cross platform suite of tools for 3D creation.
DrawKit - MIT licensed SVG illustrations, in 2 styles
Cinema 4D - Cinema 4D is a 3D modeling, animation, motion graphics and rendering application.