Anim8or is a freeware OpenGL based 3D modeling and animation program by R. Steven Glanville, a software engineer at NVidia. Currently at stable version 0.98 (version 1.0 beta 3 is available as of 22 Mar 2017), it is a compact program with several tools which would normally be expected in high-end, paid software.

To date, every version released has been under 3 MB, despite the fact that it does not make full use of the windows native interface, carrying some graphical elements of its own. Although few official tutorials have been posted by the author, many other users have posted their own on sites such as YouTube and the anim8or home page. While Anim8or was once comparable to other freeware 3D animation software such as Blender, it has seen less progression in recent years.

For more information:

https://en.wikipedia.org/wiki/Anim8or