Dune 3D is a parametric 3D CAD application. With Dune 3D you can:

• Sketch and constrain in 2D and 3D
• Add chamfers and fillets
• Import STEP models for referencing them
• Export high-quality STEP and STL files

Dune 3D is free and open source, built on a modern and legacy-free codebase and runs on Linux and Windows.