MOI (Moment of Inspiration) 3D v5 is a lightweight NURBS-based 3D modeling application aimed at designers, jewelers, and hobbyists who want a fast, intuitive tool for creating clean, surface-based models without the complexity of high-end CAD systems. The free version provides a solid introduction to MOI’s workflow and core features.
There is often a separate trial version that never expires but has moi 3d v5 free