Blender is described as 'is the free and open-source 3D creation suite. It supports the entirety of the 3D pipeline—modeling, rigging, animation, simulation, rendering, compositing, video editing, and motion tracking' and is a leading 3D Modeler in the Photos & Graphics category. There are more than 100 alternatives to Blender for a variety of platforms, including Windows, Mac, Linux, Online / Web-based and iPad. The best alternative is Autodesk Maya. It's not free, so if you're looking for a free alternative, you could try Wings 3D or Natron. Other great apps like Blender are Autodesk 3ds Max (Paid), Cinema 4D (Paid), Bforartists (Free, Open Source) and VRoid Studio (Free).
Blockbench is a free 3D modeling program featuring a modern and intuitive UI, plugin support and innovative features. It is the industry standard for creating custom 3D models for the Minecraft Marketplace.