Your own 3D parametric modeler
Вингс 3Д
Wings 3D is an advanced subdivision modeler that is both powerful and easy to use.
Годот
Godot provides a huge set of common tools, so you can just focus on making your game without reinventing the wheel.
Блендер
Blender is the free and open source 3D creation suite. It supports the entirety of the 3D pipeline—modeling, rigging, animation, simulation, rendering, compositing and motion tracking, video editing and 2D animation pipeline.