The developer offers a fully functional, 30-day trial of Moi 3D v5. This is not a watered-down "demo." You get access to every tool, every export format, and every feature.
Plasticity is a "Moi-killer" for many. It focuses on NURBS modeling with a Blender-like shortcut key style. It is slightly cheaper ($150~) but offers a limited free trial. It is not "Moi," but it fills the same workflow gap. moi 3d v5 free
MOI 3D (Moment of Inspiration) is a commercial, proprietary NURBS-based 3D modeling software developed by Michael Gibson. It is not free software. Version 5 is the current release, and it requires a paid license. The developer offers a fully functional, 30-day trial