Your own 3D parametric modeler
Vleugels 3D
Vleugels 3D
Godot
Godot provides a huge set of common tools, so you can just focus on making your game without reinventing the wheel.
Blender
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.