What most people don’t know however is that most of the visual effects were done using Blender, the legendary free and open source 3D animation suite.
Warning: NSFW language ahead :
Creating HARDCORE HENRY w/ Sharlto Copley & Ilya Naishuller – ETC Podcast
Read more about the breakdown here.
Blender has been around for more than twenty years, but has really improved a lot for filmmakers in the last five years or so since the Blender foundation released Tears of steel.