Blender

Blender is a free and open-source 3D computer graphics software toolset used for creating animated films, visual effects, art, 3D printed models, motion graphics, interactive 3D applications, and computer games. Blender’s features include 3D modeling, UV unwrapping, texturing, raster graphics editing, rigging and skinning, fluid and smoke simulation, particle simulation, soft body simulation, sculpting, animating, match moving, rendering, motion graphics, video editing, and compositing.

Wikipedia

Blender is the main tool in the 3D animation workshop and is used for nearly every task except from painting textures (done in Substance Painter) and cutting/adding audio (although this could be done in Bender as well).

Get Blender at: https://www.blender.org/