Cadyon 3D Converter reverse-engineered AutoCAD's DWG format to enable conversion of 3D solids to ISO 10303 STEP files, verified against AutoCAD's geometry across 3,656 production models. The tool offers a one-time €199 purchase with no subscription, includes browser-based viewing of multiple CAD formats, and plans to add isometric drawing generation and plant/piping plugins.
FreeCAD 1.1.3, an open-source parametric 3D CAD modeler, has been compiled to WebAssembly and runs entirely in the browser with its Qt interface, OpenCASCADE kernel, and embedded Python. No installation is required and all work remains local to the user's machine.