BLENDER - 3D SYNTHESIS IMAGES
Blender is a very complete software capable of taking on the entire chain of creation of a 3-dimensional universe: modeling, texturing, skeletonization, animation and final rendering.
Blender is a very dynamic community project that involves hundreds of people who are striving to perfect it. The software today offers performance equivalent to those paying competitors like 3DS Max, but it is little taught in graphic design schools and is therefore less used by professional animation studios.
Because of its richness and versatility, Blender can seem intimidating for someone starting out in computer graphics. Its handling will nevertheless be fairly quick if you learn how it works in an "academic" way, ie by studying its documentation, rather than by "groping".
Blender