TL;DR
Dune 3D is a new open-source parametric 3D CAD application that allows users to import and export STEP files, as well as create fillets and chamfers in their designs. It was developed out of a need for a more user-friendly CAD tool, particularly for designing 3D-printed enclosures for electronics projects. The creator found existing options like FreeCAD and Solvespace lacking in certain areas, such as user experience and essential features.