Blender is a 3D creation suite created by Ton Roosendaal for animation studio Neo Geo and Not a Number Technologies (NaN). Originally, Blender was non-free software, but when NaN went bankrupt in 2002, Roosendaal started the drive to make Blender an open source project.
According to the Blender website, "it supports the entirety of the 3D pipeline—modeling, rigging, animation, simulation, rendering, compositing and motion tracking, even video editing and game creation." Given the cost of 3d creation suite Blender is heavily used by those who want to get into 3D.
Blender is also released in GNU GPLv2 licence.