You can use goxel to create voxel graphics (3D images formed of cubes). … https://www.tromjaro.com/goxel/
F3D
F3D is a VTK-based 3D viewer following the KISS principle, so it is minimalist, efficient, has no GUI, has simple interaction mechanisms and is fully controllable using arguments in the command line. … https://www.tromjaro.com/f3d/
Sweet Home 3D
Sweet Home 3D is a free interior design application … https://www.tromjaro.com/sweet-home-3d/
OpenSCAD
The Programmers Solid 3D CAD Modeller … https://www.tromjaro.com/openscad/
LeoCad
Design virtual models you can build with LEGO® bricks … https://www.tromjaro.com/leocad/
Dust3D
Dust3D is a cross-platform open-source 3D modeling software. … https://www.tromjaro.com/dust3d/
FreeCAD
Your own 3D parametric modeler … https://www.tromjaro.com/freecad/
Wings 3D
Wings 3D is an advanced subdivision modeler that is both powerful and easy to use. … https://www.tromjaro.com/wings-3d/
Godot
Godot provides a huge set of common tools, so you can just focus on making your game without reinventing the wheel. … https://www.tromjaro.com/godot/
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. … https://www.tromjaro.com/blender/