I’m using Wings3D to create my 3D model. so far the editor is good enough for my purpose. The editor also has features for UV mapping, so if I ever become more proficient in creating 3D models this tool has got me covered for now.
Wings3D can export to DirectX format (.x) so models can be used in Monogame’s content pipeline. I plan to export the model as XML data first so I can do my own normal map calculations instead. So I may need to create a content project for this as well later on.