Yes, Blender is free
(but what does it really mean?)

A 3D mod­eller, ani­ma­tion suite and not one but two ren­der engines. Blender’s code­base is full of insane­ly com­plex work and math. So, how can it be free? We’re talk­ing about one of the most math inten­sive prob­lem domains in soft­ware. It’s no won­der that in all these years there have been very few open source